diff --git a/engine/bounding_box.go b/engine/bounding_box.go
new file mode 100644
index 0000000..0bfd1ea
--- /dev/null
+++ b/engine/bounding_box.go
@@ -0,0 +1,6 @@
+package engine
+
+type BoundingBox struct {
+	Positioned
+	Sized
+}
diff --git a/engine/grid.go b/engine/grid.go
index 47bdae8..4d594c4 100644
--- a/engine/grid.go
+++ b/engine/grid.go
@@ -1,8 +1,6 @@
 package engine
 
 import (
-	"mvvasilev/last_light/util"
-
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
 	"github.com/google/uuid"
@@ -11,10 +9,10 @@ import (
 type Grid struct {
 	id uuid.UUID
 
-	internalCellSize   util.Size
+	internalCellSize   Size
 	numCellsHorizontal int
 	numCellsVertical   int
-	position           util.Position
+	position           Position
 	style              tcell.Style
 	highlightStyle     tcell.Style
 
@@ -38,7 +36,7 @@ type Grid struct {
 	crossJunction              rune
 
 	isHighlighted   bool
-	highlightedGrid util.Position
+	highlightedGrid Position
 
 	fillRune rune
 }
@@ -79,11 +77,11 @@ func CreateGrid(
 ) *Grid {
 	return &Grid{
 		id:                         uuid.New(),
-		internalCellSize:           util.SizeOf(cellWidth, cellHeight),
+		internalCellSize:           SizeOf(cellWidth, cellHeight),
 		numCellsHorizontal:         numCellsHorizontal,
 		numCellsVertical:           numCellsVertical,
 		isHighlighted:              false,
-		position:                   util.PositionAt(x, y),
+		position:                   PositionAt(x, y),
 		style:                      style,
 		highlightStyle:             highlightStyle,
 		northBorder:                northBorder,
@@ -110,7 +108,7 @@ func (g *Grid) UniqueId() uuid.UUID {
 	return g.id
 }
 
-func (g *Grid) Highlight(highlightedGrid util.Position) {
+func (g *Grid) Highlight(highlightedGrid Position) {
 	g.isHighlighted = true
 	g.highlightedGrid = highlightedGrid
 }
@@ -119,7 +117,7 @@ func (g *Grid) Unhighlight() {
 	g.isHighlighted = false
 }
 
-func (g *Grid) Position() util.Position {
+func (g *Grid) Position() Position {
 	return g.position
 }
 
diff --git a/engine/raw.go b/engine/raw.go
index 0ea632e..f1a4789 100644
--- a/engine/raw.go
+++ b/engine/raw.go
@@ -1,8 +1,6 @@
 package engine
 
 import (
-	"mvvasilev/last_light/util"
-
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
 	"github.com/google/uuid"
@@ -11,14 +9,14 @@ import (
 type Raw struct {
 	id       uuid.UUID
 	buffer   [][]rune
-	position util.Position
+	position Position
 	style    tcell.Style
 }
 
 func CreateRawDrawable(x, y int, style tcell.Style, buffer ...string) *Raw {
 	r := new(Raw)
 
-	r.position = util.PositionAt(x, y)
+	r.position = PositionAt(x, y)
 	r.buffer = make([][]rune, 0)
 
 	for _, row := range buffer {
@@ -33,7 +31,7 @@ func CreateRawDrawable(x, y int, style tcell.Style, buffer ...string) *Raw {
 func CreateRawDrawableFromBuffer(x, y int, style tcell.Style, buffer [][]rune) *Raw {
 	r := new(Raw)
 
-	r.position = util.PositionAt(x, y)
+	r.position = PositionAt(x, y)
 	r.buffer = buffer
 
 	return r
diff --git a/engine/rectangle.go b/engine/rectangle.go
index 5b2d776..596f0a3 100644
--- a/engine/rectangle.go
+++ b/engine/rectangle.go
@@ -1,8 +1,6 @@
 package engine
 
 import (
-	"mvvasilev/last_light/util"
-
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
 	"github.com/google/uuid"
@@ -11,8 +9,8 @@ import (
 type Rectangle struct {
 	id uuid.UUID
 
-	size     util.Size
-	position util.Position
+	size     Size
+	position Position
 	style    tcell.Style
 
 	northBorder rune
@@ -103,8 +101,8 @@ func CreateRectangle(
 ) Rectangle {
 	return Rectangle{
 		id:           uuid.New(),
-		size:         util.SizeOf(width, height),
-		position:     util.PositionAt(x, y),
+		size:         SizeOf(width, height),
+		position:     PositionAt(x, y),
 		style:        style,
 		northBorder:  northBorder,
 		eastBorder:   eastBorder,
@@ -124,7 +122,7 @@ func (rect Rectangle) UniqueId() uuid.UUID {
 	return rect.id
 }
 
-func (rect Rectangle) Position() util.Position {
+func (rect Rectangle) Position() Position {
 	return rect.position
 }
 
diff --git a/engine/text.go b/engine/text.go
index 8c133d6..e2b011e 100644
--- a/engine/text.go
+++ b/engine/text.go
@@ -1,7 +1,6 @@
 package engine
 
 import (
-	"mvvasilev/last_light/util"
 	"strings"
 	"unicode/utf8"
 
@@ -13,8 +12,8 @@ import (
 type Text struct {
 	id       uuid.UUID
 	content  []string
-	position util.Position
-	size     util.Size
+	position Position
+	size     Size
 	style    tcell.Style
 }
 
@@ -29,8 +28,8 @@ func CreateText(
 	text.id = uuid.New()
 	text.content = strings.Split(content, " ")
 	text.style = style
-	text.size = util.SizeOf(width, height)
-	text.position = util.PositionAt(x, y)
+	text.size = SizeOf(width, height)
+	text.position = PositionAt(x, y)
 
 	return text
 }
@@ -39,7 +38,7 @@ func (t *Text) UniqueId() uuid.UUID {
 	return t.id
 }
 
-func (t *Text) Position() util.Position {
+func (t *Text) Position() Position {
 	return t.position
 }
 
@@ -47,7 +46,7 @@ func (t *Text) Content() string {
 	return strings.Join(t.content, " ")
 }
 
-func (t *Text) Size() util.Size {
+func (t *Text) Size() Size {
 	return t.size
 }
 
diff --git a/util/util.go b/engine/util.go
similarity index 96%
rename from util/util.go
rename to engine/util.go
index c8385f7..e3cbac2 100644
--- a/util/util.go
+++ b/engine/util.go
@@ -1,4 +1,4 @@
-package util
+package engine
 
 import "math/rand"
 
@@ -110,8 +110,3 @@ func LimitDecrement(i int, limit int) int {
 func RandInt(min, max int) int {
 	return min + rand.Intn(max-min)
 }
-
-type Room struct {
-	Positioned
-	Sized
-}
diff --git a/engine/viewport.go b/engine/viewport.go
index 6e994f2..6912036 100644
--- a/engine/viewport.go
+++ b/engine/viewport.go
@@ -1,8 +1,6 @@
 package engine
 
 import (
-	"mvvasilev/last_light/util"
-
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
 	"github.com/google/uuid"
@@ -10,15 +8,15 @@ import (
 
 type Viewport struct {
 	id             uuid.UUID
-	screenLocation util.Position
+	screenLocation Position
 
-	viewportCenter util.Position
-	viewportSize   util.Size
+	viewportCenter Position
+	viewportSize   Size
 
 	style tcell.Style
 }
 
-func CreateViewport(screenLoc, viewportCenter util.Position, size util.Size, style tcell.Style) *Viewport {
+func CreateViewport(screenLoc, viewportCenter Position, size Size, style tcell.Style) *Viewport {
 	v := new(Viewport)
 
 	v.id = uuid.New()
@@ -34,19 +32,19 @@ func (vp *Viewport) UniqueId() uuid.UUID {
 	return vp.id
 }
 
-func (vp *Viewport) Center() util.Position {
+func (vp *Viewport) Center() Position {
 	return vp.viewportCenter
 }
 
-func (vp *Viewport) SetCenter(pos util.Position) {
+func (vp *Viewport) SetCenter(pos Position) {
 	vp.viewportCenter = pos
 }
 
-func (vp *Viewport) Size() util.Size {
+func (vp *Viewport) Size() Size {
 	return vp.viewportSize
 }
 
-func (vp *Viewport) ScreenLocation() util.Position {
+func (vp *Viewport) ScreenLocation() Position {
 	return vp.screenLocation
 }
 
diff --git a/game/model/entity.go b/game/model/entity.go
index ca74272..d841fc0 100644
--- a/game/model/entity.go
+++ b/game/model/entity.go
@@ -1,7 +1,7 @@
 package model
 
 import (
-	"mvvasilev/last_light/util"
+	"mvvasilev/last_light/engine"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/google/uuid"
@@ -39,8 +39,8 @@ type Entity interface {
 }
 
 type MovableEntity interface {
-	Position() util.Position
-	MoveTo(newPosition util.Position)
+	Position() engine.Position
+	MoveTo(newPosition engine.Position)
 
 	Entity
 }
diff --git a/game/model/inventory.go b/game/model/inventory.go
index 32efdcb..3ceb23d 100644
--- a/game/model/inventory.go
+++ b/game/model/inventory.go
@@ -1,10 +1,10 @@
 package model
 
-import "mvvasilev/last_light/util"
+import "mvvasilev/last_light/engine"
 
 type Inventory interface {
 	Items() []*Item
-	Shape() util.Size
+	Shape() engine.Size
 	Push(item Item) bool
 	Drop(x, y int) *Item
 	ItemAt(x, y int) *Item
@@ -12,10 +12,10 @@ type Inventory interface {
 
 type BasicInventory struct {
 	contents []*Item
-	shape    util.Size
+	shape    engine.Size
 }
 
-func CreateInventory(shape util.Size) *BasicInventory {
+func CreateInventory(shape engine.Size) *BasicInventory {
 	inv := new(BasicInventory)
 
 	inv.contents = make([]*Item, 0, shape.Height()*shape.Width())
@@ -28,7 +28,7 @@ func (i *BasicInventory) Items() (items []*Item) {
 	return i.contents
 }
 
-func (i *BasicInventory) Shape() util.Size {
+func (i *BasicInventory) Shape() engine.Size {
 	return i.shape
 }
 
diff --git a/game/model/item_type.go b/game/model/item_type.go
index 25bdd73..5bab2ff 100644
--- a/game/model/item_type.go
+++ b/game/model/item_type.go
@@ -1,8 +1,6 @@
 package model
 
 import (
-	"math/rand"
-
 	"github.com/gdamore/tcell/v2"
 )
 
@@ -105,15 +103,3 @@ func ItemTypeKey() *ItemType {
 		maxStack:    1,
 	}
 }
-
-func GenerateItemType(genTable map[float32]*ItemType) *ItemType {
-	num := rand.Float32()
-
-	for k, v := range genTable {
-		if num > k {
-			return v
-		}
-	}
-
-	return nil
-}
diff --git a/game/model/player.go b/game/model/player.go
index bf017aa..822dea8 100644
--- a/game/model/player.go
+++ b/game/model/player.go
@@ -1,7 +1,7 @@
 package model
 
 import (
-	"mvvasilev/last_light/util"
+	"mvvasilev/last_light/engine"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/google/uuid"
@@ -9,7 +9,7 @@ import (
 
 type Player struct {
 	id       uuid.UUID
-	position util.Position
+	position engine.Position
 
 	inventory *EquippedInventory
 }
@@ -18,7 +18,7 @@ func CreatePlayer(x, y int) *Player {
 	p := new(Player)
 
 	p.id = uuid.New()
-	p.position = util.PositionAt(x, y)
+	p.position = engine.PositionAt(x, y)
 	p.inventory = CreatePlayerInventory()
 
 	return p
@@ -28,11 +28,11 @@ func (p *Player) UniqueId() uuid.UUID {
 	return p.id
 }
 
-func (p *Player) Position() util.Position {
+func (p *Player) Position() engine.Position {
 	return p.position
 }
 
-func (p *Player) MoveTo(newPos util.Position) {
+func (p *Player) MoveTo(newPos engine.Position) {
 	p.position = newPos
 }
 
diff --git a/game/model/player_inventory.go b/game/model/player_inventory.go
index 1d933fa..26541dd 100644
--- a/game/model/player_inventory.go
+++ b/game/model/player_inventory.go
@@ -1,6 +1,6 @@
 package model
 
-import "mvvasilev/last_light/util"
+import "mvvasilev/last_light/engine"
 
 type EquippedSlot int
 
@@ -27,7 +27,7 @@ type EquippedInventory struct {
 
 func CreatePlayerInventory() *EquippedInventory {
 	return &EquippedInventory{
-		BasicInventory: CreateInventory(util.SizeOf(8, 4)),
+		BasicInventory: CreateInventory(engine.SizeOf(8, 4)),
 	}
 }
 
diff --git a/game/state/inventory_screen_state.go b/game/state/inventory_screen_state.go
index bba2d66..f7ae103 100644
--- a/game/state/inventory_screen_state.go
+++ b/game/state/inventory_screen_state.go
@@ -2,9 +2,9 @@ package state
 
 import (
 	"mvvasilev/last_light/engine"
+	engine1 "mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/model"
 	"mvvasilev/last_light/game/ui/menu"
-	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
 )
@@ -14,7 +14,7 @@ type InventoryScreenState struct {
 	exitMenu  bool
 
 	inventoryMenu         *menu.PlayerInventoryMenu
-	selectedInventorySlot util.Position
+	selectedInventorySlot engine1.Position
 
 	player *model.Player
 
@@ -27,7 +27,7 @@ func CreateInventoryScreenState(player *model.Player, prevState PausableState) *
 
 	iss.prevState = prevState
 	iss.player = player
-	iss.selectedInventorySlot = util.PositionAt(0, 0)
+	iss.selectedInventorySlot = engine1.PositionAt(0, 0)
 	iss.exitMenu = false
 	iss.inventoryMenu = menu.CreatePlayerInventoryMenu(43, 0, player.Inventory(), tcell.StyleDefault, tcell.StyleDefault.Background(tcell.ColorDarkSlateGray))
 
diff --git a/game/state/main_menu_state.go b/game/state/main_menu_state.go
index 1597dd6..9de6efa 100644
--- a/game/state/main_menu_state.go
+++ b/game/state/main_menu_state.go
@@ -2,8 +2,8 @@ package state
 
 import (
 	"mvvasilev/last_light/engine"
+	engine1 "mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/ui"
-	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
 )
@@ -50,13 +50,13 @@ func NewMainMenuState() *MainMenuState {
 func (mms *MainMenuState) OnInput(e *tcell.EventKey) {
 	if e.Key() == tcell.KeyDown {
 		mms.buttons[mms.currButtonSelected].Unhighlight()
-		mms.currButtonSelected = util.LimitIncrement(mms.currButtonSelected, 2)
+		mms.currButtonSelected = engine1.LimitIncrement(mms.currButtonSelected, 2)
 		mms.buttons[mms.currButtonSelected].Highlight()
 	}
 
 	if e.Key() == tcell.KeyUp {
 		mms.buttons[mms.currButtonSelected].Unhighlight()
-		mms.currButtonSelected = util.LimitDecrement(mms.currButtonSelected, 0)
+		mms.currButtonSelected = engine1.LimitDecrement(mms.currButtonSelected, 0)
 		mms.buttons[mms.currButtonSelected].Highlight()
 	}
 
diff --git a/game/state/pause_game_state.go b/game/state/pause_game_state.go
index 32a1717..f190bcd 100644
--- a/game/state/pause_game_state.go
+++ b/game/state/pause_game_state.go
@@ -2,8 +2,8 @@ package state
 
 import (
 	"mvvasilev/last_light/engine"
+	engine1 "mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/ui"
-	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
 )
@@ -68,13 +68,13 @@ func (pg *PauseGameState) OnInput(e *tcell.EventKey) {
 
 	if e.Key() == tcell.KeyDown {
 		pg.buttons[pg.currButtonSelected].Unhighlight()
-		pg.currButtonSelected = util.LimitIncrement(pg.currButtonSelected, 1)
+		pg.currButtonSelected = engine1.LimitIncrement(pg.currButtonSelected, 1)
 		pg.buttons[pg.currButtonSelected].Highlight()
 	}
 
 	if e.Key() == tcell.KeyUp {
 		pg.buttons[pg.currButtonSelected].Unhighlight()
-		pg.currButtonSelected = util.LimitDecrement(pg.currButtonSelected, 0)
+		pg.currButtonSelected = engine1.LimitDecrement(pg.currButtonSelected, 0)
 		pg.buttons[pg.currButtonSelected].Highlight()
 	}
 
diff --git a/game/state/playing_state.go b/game/state/playing_state.go
index 319afbd..a865359 100644
--- a/game/state/playing_state.go
+++ b/game/state/playing_state.go
@@ -1,11 +1,10 @@
 package state
 
 import (
-	"math/rand"
 	"mvvasilev/last_light/engine"
+	engine1 "mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/model"
 	"mvvasilev/last_light/game/world"
-	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
@@ -27,11 +26,18 @@ type PlayingState struct {
 func BeginPlayingState() *PlayingState {
 	s := new(PlayingState)
 
-	mapSize := util.SizeOf(128, 128)
+	mapSize := engine1.SizeOf(128, 128)
 
 	dungeonLevel := world.CreateBSPDungeonMap(mapSize.Width(), mapSize.Height(), 4)
 
-	itemTiles := spawnItems(dungeonLevel)
+	genTable := make(map[float32]*model.ItemType, 0)
+
+	genTable[0.2] = model.ItemTypeFish()
+	genTable[0.05] = model.ItemTypeBow()
+	genTable[0.051] = model.ItemTypeLongsword()
+	genTable[0.052] = model.ItemTypeKey()
+
+	itemTiles := world.SpawnItems(dungeonLevel.Rooms(), 0.025, genTable)
 
 	itemLevel := world.CreateEmptyDungeonLevel(mapSize.Width(), mapSize.Height())
 
@@ -52,57 +58,15 @@ func BeginPlayingState() *PlayingState {
 	s.entityMap.AddEntity(s.player, '@', tcell.StyleDefault)
 
 	s.viewport = engine.CreateViewport(
-		util.PositionAt(0, 0),
+		engine1.PositionAt(0, 0),
 		dungeonLevel.PlayerSpawnPoint(),
-		util.SizeOf(80, 24),
+		engine1.SizeOf(80, 24),
 		tcell.StyleDefault,
 	)
 
 	return s
 }
 
-func spawnItems(level *world.BSPDungeonMap) []world.Tile {
-	rooms := level.Rooms()
-
-	genTable := make(map[float32]*model.ItemType)
-
-	genTable[0.2] = model.ItemTypeFish()
-	genTable[0.05] = model.ItemTypeBow()
-	genTable[0.051] = model.ItemTypeLongsword()
-	genTable[0.052] = model.ItemTypeKey()
-
-	itemTiles := make([]world.Tile, 0, 10)
-
-	for _, r := range rooms {
-		maxItems := int(0.10 * float64(r.Size().Area()))
-
-		if maxItems < 1 {
-			continue
-		}
-
-		numItems := rand.Intn(maxItems)
-
-		for range numItems {
-			itemType := model.GenerateItemType(genTable)
-
-			if itemType == nil {
-				continue
-			}
-
-			pos := util.PositionAt(
-				util.RandInt(r.Position().X()+1, r.Position().X()+r.Size().Width()-1),
-				util.RandInt(r.Position().Y()+1, r.Position().Y()+r.Size().Height()-1),
-			)
-
-			itemTiles = append(itemTiles, world.CreateItemTile(
-				pos, itemType, 1,
-			))
-		}
-	}
-
-	return itemTiles
-}
-
 func (ps *PlayingState) Pause() {
 	ps.pauseGame = true
 }
diff --git a/game/ui/border_button.go b/game/ui/border_button.go
index 913c665..b572cbf 100644
--- a/game/ui/border_button.go
+++ b/game/ui/border_button.go
@@ -2,7 +2,7 @@ package ui
 
 import (
 	"mvvasilev/last_light/engine"
-	"mvvasilev/last_light/util"
+	engine1 "mvvasilev/last_light/engine"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
@@ -45,11 +45,11 @@ func (b *UIBorderedButton) MoveTo(x int, y int) {
 	panic("not implemented") // TODO: Implement
 }
 
-func (b *UIBorderedButton) Position() util.Position {
+func (b *UIBorderedButton) Position() engine1.Position {
 	panic("not implemented") // TODO: Implement
 }
 
-func (b *UIBorderedButton) Size() util.Size {
+func (b *UIBorderedButton) Size() engine1.Size {
 	panic("not implemented") // TODO: Implement
 }
 
diff --git a/game/ui/container.go b/game/ui/container.go
index c955d38..0dde369 100644
--- a/game/ui/container.go
+++ b/game/ui/container.go
@@ -1,7 +1,7 @@
 package ui
 
 import (
-	"mvvasilev/last_light/util"
+	"mvvasilev/last_light/engine"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
@@ -28,8 +28,8 @@ const (
 type UIContainer struct {
 	id       uuid.UUID
 	layout   UIContainerLayout
-	position util.Position
-	size     util.Size
+	position engine.Position
+	size     engine.Size
 	elements []UIElement
 }
 
@@ -38,8 +38,8 @@ func CreateUIContainer(x, y int, width, height int, layout UIContainerLayout) *U
 
 	container.id = uuid.New()
 	container.layout = layout
-	container.position = util.PositionAt(x, y)
-	container.size = util.SizeOf(width, height)
+	container.position = engine.PositionAt(x, y)
+	container.size = engine.SizeOf(width, height)
 	container.elements = make([]UIElement, 0)
 
 	return container
@@ -58,14 +58,14 @@ func (uic *UIContainer) UniqueId() uuid.UUID {
 }
 
 func (uic *UIContainer) MoveTo(x, y int) {
-	uic.position = util.PositionAt(x, y)
+	uic.position = engine.PositionAt(x, y)
 }
 
-func (uic *UIContainer) Position() util.Position {
+func (uic *UIContainer) Position() engine.Position {
 	return uic.position
 }
 
-func (uic *UIContainer) Size() util.Size {
+func (uic *UIContainer) Size() engine.Size {
 	return uic.size
 }
 
diff --git a/game/ui/label.go b/game/ui/label.go
index fef57f8..6828226 100644
--- a/game/ui/label.go
+++ b/game/ui/label.go
@@ -2,7 +2,7 @@ package ui
 
 import (
 	"mvvasilev/last_light/engine"
-	"mvvasilev/last_light/util"
+	engine1 "mvvasilev/last_light/engine"
 	"unicode/utf8"
 
 	"github.com/gdamore/tcell/v2"
@@ -41,11 +41,11 @@ func (t *UILabel) MoveTo(x int, y int) {
 	t.text = engine.CreateText(x, y, int(t.text.Size().Width()), int(t.Size().Height()), t.text.Content(), t.text.Style())
 }
 
-func (t *UILabel) Position() util.Position {
+func (t *UILabel) Position() engine1.Position {
 	return t.text.Position()
 }
 
-func (t *UILabel) Size() util.Size {
+func (t *UILabel) Size() engine1.Size {
 	return t.text.Size()
 }
 
diff --git a/game/ui/menu/player_inventory_menu.go b/game/ui/menu/player_inventory_menu.go
index 8da4545..6980a3d 100644
--- a/game/ui/menu/player_inventory_menu.go
+++ b/game/ui/menu/player_inventory_menu.go
@@ -3,9 +3,9 @@ package menu
 import (
 	"fmt"
 	"mvvasilev/last_light/engine"
+	engine1 "mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/model"
 	"mvvasilev/last_light/game/ui"
-	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/gdamore/tcell/v2/views"
@@ -27,7 +27,7 @@ type PlayerInventoryMenu struct {
 	selectedItem   *engine.ArbitraryDrawable
 	help           *ui.UILabel
 
-	selectedInventorySlot util.Position
+	selectedInventorySlot engine1.Position
 }
 
 func CreatePlayerInventoryMenu(x, y int, playerInventory *model.EquippedInventory, style tcell.Style, highlightStyle tcell.Style) *PlayerInventoryMenu {
@@ -138,11 +138,11 @@ func (pim *PlayerInventoryMenu) MoveTo(x int, y int) {
 
 }
 
-func (pim *PlayerInventoryMenu) Position() util.Position {
+func (pim *PlayerInventoryMenu) Position() engine1.Position {
 	return pim.inventoryMenu.Position()
 }
 
-func (pim *PlayerInventoryMenu) Size() util.Size {
+func (pim *PlayerInventoryMenu) Size() engine1.Size {
 	return pim.inventoryMenu.Size()
 }
 
@@ -156,7 +156,7 @@ func (pim *PlayerInventoryMenu) UniqueId() uuid.UUID {
 
 func (pim *PlayerInventoryMenu) SelectSlot(x, y int) {
 	pim.inventoryGrid.Unhighlight()
-	pim.selectedInventorySlot = util.PositionAt(x, y)
+	pim.selectedInventorySlot = engine1.PositionAt(x, y)
 	pim.inventoryGrid.Highlight(pim.selectedInventorySlot)
 }
 
diff --git a/game/ui/simple_button.go b/game/ui/simple_button.go
index 5539be7..f6a7cca 100644
--- a/game/ui/simple_button.go
+++ b/game/ui/simple_button.go
@@ -2,7 +2,7 @@ package ui
 
 import (
 	"mvvasilev/last_light/engine"
-	"mvvasilev/last_light/util"
+	engine1 "mvvasilev/last_light/engine"
 	"strings"
 	"unicode/utf8"
 
@@ -85,11 +85,11 @@ func (sb *UISimpleButton) MoveTo(x int, y int) {
 	sb.text = engine.CreateText(x, y, int(utf8.RuneCountInString(sb.text.Content())), 1, sb.text.Content(), sb.highlightedStyle)
 }
 
-func (sb *UISimpleButton) Position() util.Position {
+func (sb *UISimpleButton) Position() engine1.Position {
 	return sb.text.Position()
 }
 
-func (sb *UISimpleButton) Size() util.Size {
+func (sb *UISimpleButton) Size() engine1.Size {
 	return sb.text.Size()
 }
 
diff --git a/game/ui/ui.go b/game/ui/ui.go
index b6e0c52..0305b24 100644
--- a/game/ui/ui.go
+++ b/game/ui/ui.go
@@ -2,15 +2,15 @@ package ui
 
 import (
 	"mvvasilev/last_light/engine"
-	"mvvasilev/last_light/util"
+	engine1 "mvvasilev/last_light/engine"
 
 	"github.com/gdamore/tcell/v2"
 )
 
 type UIElement interface {
 	MoveTo(x, y int)
-	Position() util.Position
-	Size() util.Size
+	Position() engine1.Position
+	Size() engine1.Size
 	Input(e *tcell.EventKey)
 
 	engine.Drawable
diff --git a/game/ui/window.go b/game/ui/window.go
index 4c8b5c7..b14c466 100644
--- a/game/ui/window.go
+++ b/game/ui/window.go
@@ -2,7 +2,7 @@ package ui
 
 import (
 	"mvvasilev/last_light/engine"
-	"mvvasilev/last_light/util"
+	engine1 "mvvasilev/last_light/engine"
 	"unicode/utf8"
 
 	"github.com/gdamore/tcell/v2"
@@ -45,12 +45,12 @@ func (w *UIWindow) MoveTo(x int, y int) {
 
 }
 
-func (w *UIWindow) Position() util.Position {
+func (w *UIWindow) Position() engine1.Position {
 	return w.box.Position()
 }
 
-func (w *UIWindow) Size() util.Size {
-	return util.SizeOf(0, 0)
+func (w *UIWindow) Size() engine1.Size {
+	return engine1.SizeOf(0, 0)
 }
 
 func (w *UIWindow) Draw(v views.View) {
diff --git a/game/world/bsp_map.go b/game/world/bsp_map.go
index 2be2b5e..e38b591 100644
--- a/game/world/bsp_map.go
+++ b/game/world/bsp_map.go
@@ -1,21 +1,21 @@
 package world
 
 import (
-	"mvvasilev/last_light/util"
+	"mvvasilev/last_light/engine"
 )
 
 type BSPDungeonMap struct {
 	level *BasicMap
 
-	playerSpawnPoint util.Position
-	rooms            []util.Room
+	playerSpawnPoint engine.Position
+	rooms            []engine.BoundingBox
 }
 
-func (bsp *BSPDungeonMap) PlayerSpawnPoint() util.Position {
+func (bsp *BSPDungeonMap) PlayerSpawnPoint() engine.Position {
 	return bsp.playerSpawnPoint
 }
 
-func (bsp *BSPDungeonMap) Size() util.Size {
+func (bsp *BSPDungeonMap) Size() engine.Size {
 	return bsp.level.Size()
 }
 
@@ -30,6 +30,6 @@ func (bsp *BSPDungeonMap) TileAt(x int, y int) Tile {
 func (bsp *BSPDungeonMap) Tick(dt int64) {
 }
 
-func (bsp *BSPDungeonMap) Rooms() []util.Room {
+func (bsp *BSPDungeonMap) Rooms() []engine.BoundingBox {
 	return bsp.rooms
 }
diff --git a/game/world/empty_map.go b/game/world/empty_map.go
index a5b07be..16f7c8c 100644
--- a/game/world/empty_map.go
+++ b/game/world/empty_map.go
@@ -1,12 +1,12 @@
 package world
 
-import "mvvasilev/last_light/util"
+import "mvvasilev/last_light/engine"
 
 type EmptyDungeonMap struct {
 	level *BasicMap
 }
 
-func (edl *EmptyDungeonMap) Size() util.Size {
+func (edl *EmptyDungeonMap) Size() engine.Size {
 	return edl.level.Size()
 }
 
diff --git a/game/world/entity_map.go b/game/world/entity_map.go
index a44a3f8..e62093c 100644
--- a/game/world/entity_map.go
+++ b/game/world/entity_map.go
@@ -2,8 +2,8 @@ package world
 
 import (
 	"maps"
+	"mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/model"
-	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
 	"github.com/google/uuid"
@@ -12,13 +12,13 @@ import (
 type EntityMap struct {
 	entities map[int]EntityTile
 
-	util.Sized
+	engine.Sized
 }
 
 func CreateEntityMap(width, height int) *EntityMap {
 	return &EntityMap{
 		entities: make(map[int]EntityTile, 0),
-		Sized:    util.WithSize(util.SizeOf(width, height)),
+		Sized:    engine.WithSize(engine.SizeOf(width, height)),
 	}
 }
 
@@ -55,11 +55,7 @@ func (em *EntityMap) AddEntity(entity model.MovableEntity, presentation rune, st
 
 func (em *EntityMap) DropEntity(uuid uuid.UUID) {
 	maps.DeleteFunc(em.entities, func(i int, et EntityTile) bool {
-		if et.Entity().UniqueId() == uuid {
-			return true
-		}
-
-		return false
+		return et.Entity().UniqueId() == uuid
 	})
 }
 
diff --git a/game/world/generate_bsp_map.go b/game/world/generate_bsp_map.go
index b209def..ba51cbc 100644
--- a/game/world/generate_bsp_map.go
+++ b/game/world/generate_bsp_map.go
@@ -2,7 +2,7 @@ package world
 
 import (
 	"math/rand"
-	"mvvasilev/last_light/util"
+	"mvvasilev/last_light/engine"
 )
 
 type splitDirection bool
@@ -13,10 +13,10 @@ const (
 )
 
 type bspNode struct {
-	origin util.Position
-	size   util.Size
+	origin engine.Position
+	size   engine.Size
 
-	room    util.Room
+	room    engine.BoundingBox
 	hasRoom bool
 
 	left  *bspNode
@@ -28,8 +28,8 @@ type bspNode struct {
 func CreateBSPDungeonMap(width, height int, numSplits int) *BSPDungeonMap {
 	root := new(bspNode)
 
-	root.origin = util.PositionAt(0, 0)
-	root.size = util.SizeOf(width, height)
+	root.origin = engine.PositionAt(0, 0)
+	root.size = engine.SizeOf(width, height)
 
 	split(root, numSplits)
 
@@ -39,13 +39,13 @@ func CreateBSPDungeonMap(width, height int, numSplits int) *BSPDungeonMap {
 		tiles[h] = make([]Tile, width)
 	}
 
-	rooms := make([]util.Room, 0, 2^numSplits)
+	rooms := make([]engine.BoundingBox, 0, 2^numSplits)
 
 	iterateBspLeaves(root, func(leaf *bspNode) {
-		x := util.RandInt(leaf.origin.X(), leaf.origin.X()+leaf.size.Width()/4)
-		y := util.RandInt(leaf.origin.Y(), leaf.origin.Y()+leaf.size.Height()/4)
-		w := util.RandInt(3, leaf.size.Width()-1)
-		h := util.RandInt(3, leaf.size.Height()-1)
+		x := engine.RandInt(leaf.origin.X(), leaf.origin.X()+leaf.size.Width()/4)
+		y := engine.RandInt(leaf.origin.Y(), leaf.origin.Y()+leaf.size.Height()/4)
+		w := engine.RandInt(3, leaf.size.Width()-1)
+		h := engine.RandInt(3, leaf.size.Height()-1)
 
 		if x+w >= width {
 			w = w - (x + w - width) - 1
@@ -55,9 +55,9 @@ func CreateBSPDungeonMap(width, height int, numSplits int) *BSPDungeonMap {
 			h = h - (y + h - height) - 1
 		}
 
-		room := util.Room{
-			Positioned: util.WithPosition(util.PositionAt(x, y)),
-			Sized:      util.WithSize(util.SizeOf(w, h)),
+		room := engine.BoundingBox{
+			Positioned: engine.WithPosition(engine.PositionAt(x, y)),
+			Sized:      engine.WithSize(engine.SizeOf(w, h)),
 		}
 
 		rooms = append(rooms, room)
@@ -74,11 +74,11 @@ func CreateBSPDungeonMap(width, height int, numSplits int) *BSPDungeonMap {
 
 		zCorridor(
 			tiles,
-			util.PositionAt(
+			engine.PositionAt(
 				roomLeft.Position().X()+roomLeft.Size().Width()/2,
 				roomLeft.Position().Y()+roomLeft.Size().Height()/2,
 			),
-			util.PositionAt(
+			engine.PositionAt(
 				roomRight.Position().X()+roomRight.Size().Width()/2,
 				roomRight.Position().Y()+roomRight.Size().Height()/2,
 			),
@@ -92,7 +92,7 @@ func CreateBSPDungeonMap(width, height int, numSplits int) *BSPDungeonMap {
 
 	bsp.rooms = rooms
 	bsp.level = CreateBasicMap(tiles)
-	bsp.playerSpawnPoint = util.PositionAt(
+	bsp.playerSpawnPoint = engine.PositionAt(
 		spawnRoom.Position().X()+spawnRoom.Size().Width()/2,
 		spawnRoom.Position().Y()+spawnRoom.Size().Height()/2,
 	)
@@ -100,7 +100,7 @@ func CreateBSPDungeonMap(width, height int, numSplits int) *BSPDungeonMap {
 	return bsp
 }
 
-func findRoom(parent *bspNode) util.Room {
+func findRoom(parent *bspNode) engine.BoundingBox {
 	if parent.hasRoom {
 		return parent.room
 	}
@@ -112,7 +112,7 @@ func findRoom(parent *bspNode) util.Room {
 	}
 }
 
-func zCorridor(tiles [][]Tile, from util.Position, to util.Position, direction splitDirection) {
+func zCorridor(tiles [][]Tile, from engine.Position, to engine.Position, direction splitDirection) {
 	switch direction {
 	case splitDirectionHorizontal:
 		xMidPoint := (from.X() + to.X()) / 2
@@ -164,30 +164,30 @@ func split(parent *bspNode, numSplits int) {
 	// split vertically
 	if parent.size.Width() > parent.size.Height() {
 		// New splits will be between 45% and 65% of the parent's width
-		leftSplitWidth := util.RandInt(int(float32(parent.size.Width())*0.45), int(float32(parent.size.Width())*0.65))
+		leftSplitWidth := engine.RandInt(int(float32(parent.size.Width())*0.45), int(float32(parent.size.Width())*0.65))
 
 		parent.splitDir = splitDirectionVertical
 
 		parent.left = new(bspNode)
 		parent.left.origin = parent.origin
-		parent.left.size = util.SizeOf(leftSplitWidth, parent.size.Height())
+		parent.left.size = engine.SizeOf(leftSplitWidth, parent.size.Height())
 
 		parent.right = new(bspNode)
 		parent.right.origin = parent.origin.WithOffset(leftSplitWidth, 0)
-		parent.right.size = util.SizeOf(parent.size.Width()-leftSplitWidth, parent.size.Height())
+		parent.right.size = engine.SizeOf(parent.size.Width()-leftSplitWidth, parent.size.Height())
 	} else { // split horizontally
 		// New splits will be between 45% and 65% of the parent's height
-		leftSplitHeight := util.RandInt(int(float32(parent.size.Height())*0.45), int(float32(parent.size.Height())*0.65))
+		leftSplitHeight := engine.RandInt(int(float32(parent.size.Height())*0.45), int(float32(parent.size.Height())*0.65))
 
 		parent.splitDir = splitDirectionHorizontal
 
 		parent.left = new(bspNode)
 		parent.left.origin = parent.origin
-		parent.left.size = util.SizeOf(parent.size.Width(), leftSplitHeight)
+		parent.left.size = engine.SizeOf(parent.size.Width(), leftSplitHeight)
 
 		parent.right = new(bspNode)
 		parent.right.origin = parent.origin.WithOffset(0, leftSplitHeight)
-		parent.right.size = util.SizeOf(parent.size.Width(), parent.size.Height()-leftSplitHeight)
+		parent.right.size = engine.SizeOf(parent.size.Width(), parent.size.Height()-leftSplitHeight)
 	}
 
 	split(parent.left, numSplits-1)
@@ -256,7 +256,7 @@ func placeWallAtIfNotPassable(tiles [][]Tile, x, y int) {
 	tiles[y][x] = CreateStaticTile(x, y, TileTypeWall())
 }
 
-func makeRoom(tiles [][]Tile, room util.Room) {
+func makeRoom(tiles [][]Tile, room engine.BoundingBox) {
 	width := room.Size().Width()
 	height := room.Size().Height()
 	x := room.Position().X()
diff --git a/game/world/generate_items.go b/game/world/generate_items.go
new file mode 100644
index 0000000..eca0352
--- /dev/null
+++ b/game/world/generate_items.go
@@ -0,0 +1,52 @@
+package world
+
+import (
+	"math/rand"
+	"mvvasilev/last_light/engine"
+	"mvvasilev/last_light/game/model"
+)
+
+func SpawnItems(spawnableAreas []engine.BoundingBox, maxItemRatio float32, genTable map[float32]*model.ItemType) []Tile {
+	rooms := spawnableAreas
+
+	itemTiles := make([]Tile, 0, 10)
+
+	for _, r := range rooms {
+		maxItems := int(maxItemRatio * float32(r.Size().Area()))
+
+		if maxItems < 1 {
+			continue
+		}
+
+		numItems := rand.Intn(maxItems)
+
+		for range numItems {
+			itemType := GenerateItemType(genTable)
+
+			if itemType == nil {
+				continue
+			}
+
+			pos := engine.PositionAt(
+				engine.RandInt(r.Position().X()+1, r.Position().X()+r.Size().Width()-1),
+				engine.RandInt(r.Position().Y()+1, r.Position().Y()+r.Size().Height()-1),
+			)
+
+			itemTiles = append(itemTiles, CreateItemTile(pos, itemType, 1))
+		}
+	}
+
+	return itemTiles
+}
+
+func GenerateItemType(genTable map[float32]*model.ItemType) *model.ItemType {
+	num := rand.Float32()
+
+	for k, v := range genTable {
+		if num > k {
+			return v
+		}
+	}
+
+	return nil
+}
diff --git a/game/world/map.go b/game/world/map.go
index e4c3841..35873d4 100644
--- a/game/world/map.go
+++ b/game/world/map.go
@@ -1,23 +1,23 @@
 package world
 
 import (
-	"mvvasilev/last_light/util"
+	"mvvasilev/last_light/engine"
 )
 
 type Map interface {
-	Size() util.Size
+	Size() engine.Size
 	SetTileAt(x, y int, t Tile)
 	TileAt(x, y int) Tile
 	Tick(dt int64)
 }
 
 type WithPlayerSpawnPoint interface {
-	PlayerSpawnPoint() util.Position
+	PlayerSpawnPoint() engine.Position
 	Map
 }
 
 type WithRooms interface {
-	Rooms() []util.Room
+	Rooms() []engine.BoundingBox
 	Map
 }
 
@@ -36,8 +36,8 @@ func CreateBasicMap(tiles [][]Tile) *BasicMap {
 func (bm *BasicMap) Tick() {
 }
 
-func (bm *BasicMap) Size() util.Size {
-	return util.SizeOf(len(bm.tiles[0]), len(bm.tiles))
+func (bm *BasicMap) Size() engine.Size {
+	return engine.SizeOf(len(bm.tiles[0]), len(bm.tiles))
 }
 
 func (bm *BasicMap) SetTileAt(x int, y int, t Tile) {
diff --git a/game/world/multilevel_map.go b/game/world/multilevel_map.go
index e2979e5..e10fd30 100644
--- a/game/world/multilevel_map.go
+++ b/game/world/multilevel_map.go
@@ -1,6 +1,6 @@
 package world
 
-import "mvvasilev/last_light/util"
+import "mvvasilev/last_light/engine"
 
 type MultilevelMap struct {
 	layers []Map
@@ -14,9 +14,9 @@ func CreateMultilevelMap(maps ...Map) *MultilevelMap {
 	return m
 }
 
-func (mm *MultilevelMap) Size() util.Size {
+func (mm *MultilevelMap) Size() engine.Size {
 	if len(mm.layers) == 0 {
-		return util.SizeOf(0, 0)
+		return engine.SizeOf(0, 0)
 	}
 
 	return mm.layers[0].Size()
diff --git a/game/world/tile.go b/game/world/tile.go
index d138ec3..3be6e0f 100644
--- a/game/world/tile.go
+++ b/game/world/tile.go
@@ -1,8 +1,8 @@
 package world
 
 import (
+	"mvvasilev/last_light/engine"
 	"mvvasilev/last_light/game/model"
-	"mvvasilev/last_light/util"
 
 	"github.com/gdamore/tcell/v2"
 )
@@ -98,27 +98,27 @@ func TileTypeOpenDoor() TileType {
 }
 
 type Tile interface {
-	Position() util.Position
+	Position() engine.Position
 	Presentation() (rune, tcell.Style)
 	Passable() bool
 	Transparent() bool
 }
 
 type StaticTile struct {
-	position util.Position
+	position engine.Position
 	t        TileType
 }
 
 func CreateStaticTile(x, y int, t TileType) Tile {
 	st := new(StaticTile)
 
-	st.position = util.PositionAt(x, y)
+	st.position = engine.PositionAt(x, y)
 	st.t = t
 
 	return st
 }
 
-func (st *StaticTile) Position() util.Position {
+func (st *StaticTile) Position() engine.Position {
 	return st.position
 }
 
@@ -139,12 +139,12 @@ func (st *StaticTile) Type() TileType {
 }
 
 type ItemTile struct {
-	position util.Position
+	position engine.Position
 	itemType *model.ItemType
 	quantity int
 }
 
-func CreateItemTile(position util.Position, itemType *model.ItemType, quantity int) *ItemTile {
+func CreateItemTile(position engine.Position, itemType *model.ItemType, quantity int) *ItemTile {
 	it := new(ItemTile)
 
 	it.position = position
@@ -162,7 +162,7 @@ func (it *ItemTile) Quantity() int {
 	return it.quantity
 }
 
-func (it *ItemTile) Position() util.Position {
+func (it *ItemTile) Position() engine.Position {
 	return it.position
 }
 
@@ -202,7 +202,7 @@ func (bet *BasicEntityTile) Entity() model.MovableEntity {
 	return bet.entity
 }
 
-func (bet *BasicEntityTile) Position() util.Position {
+func (bet *BasicEntityTile) Position() engine.Position {
 	return bet.entity.Position()
 }