diff --git a/game/builtin/item.go b/game/builtin/item.go
deleted file mode 100644
index d3f0775..0000000
--- a/game/builtin/item.go
+++ /dev/null
@@ -1,51 +0,0 @@
-package builtin
-
-import "github.com/kercylan98/minotaur/utils/huge"
-
-func NewItem[ID comparable](id ID, options ...ItemOption[ID]) *Item[ID] {
-	item := &Item[ID]{
-		id: id,
-	}
-	for _, option := range options {
-		option(item)
-	}
-	return item
-}
-
-type Item[ID comparable] struct {
-	id         ID
-	stackLimit *huge.Int
-	count      *huge.Int
-}
-
-func (slf *Item[ID]) GetID() ID {
-	return slf.id
-}
-
-func (slf *Item[ID]) GetCount() *huge.Int {
-	return slf.count
-}
-
-func (slf *Item[ID]) GetStackLimit() *huge.Int {
-	return slf.stackLimit
-}
-
-func (slf *Item[ID]) SetCount(count *huge.Int) {
-	if count.LessThan(huge.IntZero) {
-		slf.count = huge.IntZero.Copy()
-		return
-	}
-	slf.count = count.Copy()
-}
-
-func (slf *Item[ID]) ChangeCount(count *huge.Int) error {
-	newCount := slf.count.Copy().Add(count)
-	if newCount.LessThan(huge.IntZero) {
-		return ErrItemInsufficientQuantityDeduction
-	}
-	if newCount.GreaterThan(slf.stackLimit) {
-		return ErrItemStackLimit
-	}
-	slf.count = newCount
-	return nil
-}
diff --git a/game/builtin/item_errors.go b/game/builtin/item_errors.go
deleted file mode 100644
index 25e14bd..0000000
--- a/game/builtin/item_errors.go
+++ /dev/null
@@ -1,8 +0,0 @@
-package builtin
-
-import "errors"
-
-var (
-	ErrItemInsufficientQuantityDeduction = errors.New("insufficient quantity deduction")
-	ErrItemStackLimit                    = errors.New("the number of items reaches the stacking limit")
-)
diff --git a/game/builtin/item_options.go b/game/builtin/item_options.go
deleted file mode 100644
index 55d43c7..0000000
--- a/game/builtin/item_options.go
+++ /dev/null
@@ -1,16 +0,0 @@
-package builtin
-
-import "github.com/kercylan98/minotaur/utils/huge"
-
-type ItemOption[ID comparable] func(item *Item[ID])
-
-// WithItemStackLimit 通过特定堆叠上限创建物品
-//   - 默认无限制
-func WithItemStackLimit[ID comparable](stackLimit *huge.Int) ItemOption[ID] {
-	return func(item *Item[ID]) {
-		if stackLimit == nil || stackLimit.LessThanOrEqualTo(huge.IntZero) {
-			return
-		}
-		item.stackLimit = stackLimit
-	}
-}
diff --git a/game/item.go b/game/item.go
deleted file mode 100644
index 73742c3..0000000
--- a/game/item.go
+++ /dev/null
@@ -1,17 +0,0 @@
-package game
-
-import "github.com/kercylan98/minotaur/utils/huge"
-
-// Item 物品
-type Item[ID comparable] interface {
-	// GetID 获取物品id
-	GetID() ID
-	// GetCount 获取物品数量
-	GetCount() *huge.Int
-	// GetStackLimit 获取堆叠上限
-	GetStackLimit() *huge.Int
-	// SetCount 设置物品数量
-	SetCount(count *huge.Int)
-	// ChangeCount 改变物品数量
-	ChangeCount(count *huge.Int) error
-}