diff --git a/domain/inventory.go b/domain/inventory.go
new file mode 100644
index 0000000..467f83c
--- /dev/null
+++ b/domain/inventory.go
@@ -0,0 +1,15 @@
+package domain
+
+import "game/konstructor/entity"
+
+func (d *Domain) AddToInventory(item *entity.Item) bool {
+	return true
+}
+
+func (d *Domain) RemoveFromInventory(item *entity.Item) bool {
+	return true
+}
+
+func (d *Domain) UseInventoryItem(item *entity.Item) bool {
+	return true
+}
diff --git a/konstructor/engine/engine.inventory.go b/konstructor/engine/engine.inventory.go
new file mode 100644
index 0000000..dfb1994
--- /dev/null
+++ b/konstructor/engine/engine.inventory.go
@@ -0,0 +1,15 @@
+package engine
+
+import "game/konstructor/entity"
+
+func (e *Engine) AddToInventory(item *entity.Item) {
+	e.Domain.AddToInventory(item)
+}
+
+func (e *Engine) RemoveFromInventory(item *entity.Item) {
+	e.Domain.RemoveFromInventory(item)
+}
+
+func (e *Engine) UseInventoryItem(item *entity.Item) {
+	e.Domain.UseInventoryItem(item)
+}
diff --git a/konstructor/entity/entity.domain.go b/konstructor/entity/entity.domain.go
index 3807996..6b2522e 100644
--- a/konstructor/entity/entity.domain.go
+++ b/konstructor/entity/entity.domain.go
@@ -7,4 +7,7 @@ type DomainInterface interface {
 	GetDialog(name string) Dialog
 	SetDialog(name string, menu Dialog)
 	GetLevel(index int) Level
+	AddToInventory(item *Item) bool
+	RemoveFromInventory(item *Item) bool
+	UseInventoryItem(item *Item) bool
 }
diff --git a/konstructor/entity/entity.item.go b/konstructor/entity/entity.item.go
new file mode 100644
index 0000000..09bf7b5
--- /dev/null
+++ b/konstructor/entity/entity.item.go
@@ -0,0 +1,12 @@
+package entity
+
+type ItemType struct {
+	ID            string
+	RenderOptions RenderOptions
+}
+
+type Item struct {
+	ID       string
+	Type     ItemType
+	Position Position
+}
diff --git a/konstructor/entity/entity.npc.go b/konstructor/entity/entity.npc.go
new file mode 100644
index 0000000..fc6ac37
--- /dev/null
+++ b/konstructor/entity/entity.npc.go
@@ -0,0 +1,12 @@
+package entity
+
+type NPCType struct {
+	ID            string
+	RenderOptions RenderOptions
+}
+
+type NPC struct {
+	ID       string
+	Type     NPCType
+	Position Position
+}
diff --git a/konstructor/entity/entity.object.go b/konstructor/entity/entity.object.go
new file mode 100644
index 0000000..3e454bb
--- /dev/null
+++ b/konstructor/entity/entity.object.go
@@ -0,0 +1,12 @@
+package entity
+
+type ObjectType struct {
+	ID            string
+	RenderOptions RenderOptions
+}
+
+type Object struct {
+	ID       string
+	Type     ObjectType
+	Position Position
+}
diff --git a/konstructor/entity/entity.player.go b/konstructor/entity/entity.player.go
new file mode 100644
index 0000000..2119557
--- /dev/null
+++ b/konstructor/entity/entity.player.go
@@ -0,0 +1,18 @@
+package entity
+
+type InventoryItem struct {
+	Item   Item
+	Used   bool
+	Active bool
+}
+
+type Inventory struct {
+	Items []InventoryItem
+}
+
+type Player struct {
+	ID            string
+	RenderOptions RenderOptions
+	Position      Position
+	Inventory     Inventory
+}
diff --git a/konstructor/entity/entity.playground.go b/konstructor/entity/entity.playground.go
index ec6bd57..41dd1bd 100644
--- a/konstructor/entity/entity.playground.go
+++ b/konstructor/entity/entity.playground.go
@@ -7,48 +7,10 @@ type Position struct {
 }
 
 type RenderOptions struct {
-	Image  string
-	Width  int
-	Height int
-}
-
-type ObjectType struct {
-	ID            string
-	RenderOptions RenderOptions
-}
-
-type Object struct {
-	ID       string
-	Type     ObjectType
-	Position Position
-}
-
-type NPCType struct {
-	ID            string
-	RenderOptions RenderOptions
-}
-
-type NPC struct {
-	ID       string
-	Type     NPCType
-	Position Position
-}
-
-type Player struct {
-	ID            string
-	RenderOptions RenderOptions
-	Position      Position
-}
-
-type ItemType struct {
-	ID            string
-	RenderOptions RenderOptions
-}
-
-type Item struct {
-	ID       string
-	Type     ItemType
-	Position Position
+	Image   string
+	Width   int
+	Height  int
+	Visible bool
 }
 
 type Playground struct {
diff --git a/konstructor/entity/entity.settings.go b/konstructor/entity/entity.settings.go
index c651383..7c939b8 100644
--- a/konstructor/entity/entity.settings.go
+++ b/konstructor/entity/entity.settings.go
@@ -21,5 +21,5 @@ type ScreenSettings struct {
 type Settings struct {
 	Name   string
 	Screen *ScreenSettings
-	KeyMap *KeyMap
+	KeyMap KeyMap
 }
diff --git a/main.go b/main.go
index cc9df33..bc53a24 100644
--- a/main.go
+++ b/main.go
@@ -33,7 +33,7 @@ func main() {
 				Width:  640,
 				Height: 480,
 			},
-			KeyMap: &entity.KeyMap{
+			KeyMap: entity.KeyMap{
 				Up:      ebiten.KeyUp,
 				Down:    ebiten.KeyDown,
 				Right:   ebiten.KeyRight,