diff --git a/utils/g2d/dropper.go b/utils/g2d/dropper.go
new file mode 100644
index 0000000..752b90c
--- /dev/null
+++ b/utils/g2d/dropper.go
@@ -0,0 +1,33 @@
+package g2d
+
+func NewDropper[T any](matrix [][]T, setPosition func(x, y, newX, newY int), allowDrop, allowCross, isObstacle func(data T) bool) *Dropper[T] {
+	return &Dropper[T]{
+		matrix:      matrix,
+		width:       len(matrix) + 1,
+		height:      len(matrix[0]),
+		setPosition: setPosition,
+		allowDrop:   allowDrop,
+		allowCross:  allowCross,
+		isObstacle:  isObstacle,
+	}
+}
+
+// Dropper 掉落器
+type Dropper[T any] struct {
+	matrix                            [][]T
+	width, height                     int
+	setPosition                       func(x, y, newX, newY int)
+	allowDrop, allowCross, isObstacle func(data T) bool
+}
+
+func (slf *Dropper[T]) Drop() {
+
+	for x := 0; x < slf.width; x++ {
+		for y := slf.height - 1; y >= 0; y-- {
+			data := slf.matrix[x][y]
+			if slf.allowDrop(data) {
+
+			}
+		}
+	}
+}
diff --git a/utils/g2d/g2d.go b/utils/g2d/g2d.go
index 00a4bca..39f3734 100644
--- a/utils/g2d/g2d.go
+++ b/utils/g2d/g2d.go
@@ -10,6 +10,7 @@ func PositionArrayToXY(position [2]int) (x, y int) {
 	return position[0], position[1]
 }
 
+// PositionClone 克隆一个坐标数组
 func PositionClone(position [2]int) [2]int {
 	return [2]int{position[0], position[1]}
 }