diff --git a/game.go b/game.go
index 5907114f..56f082eb 100644
--- a/game.go
+++ b/game.go
@@ -254,7 +254,7 @@ func Gopt_Game_Run(game Gamer, resource interface{}, gameConf ...*Config) {
 	}
 	g.startLoad(fs, &conf)
 	for i, n := 0, v.NumField(); i < n; i++ {
-		name, val := getFieldPtrOrAlloc(v, i)
+		name, val := getFieldPtrOrAlloc(g, v, i)
 		switch fld := val.(type) {
 		case *Sound:
 			if g.canBindSound(name) {
@@ -301,17 +301,24 @@ func instance(gamer reflect.Value) *Game {
 	return fld.Addr().Interface().(*Game)
 }
 
-func getFieldPtrOrAlloc(v reflect.Value, i int) (name string, val interface{}) {
+func getFieldPtrOrAlloc(g *Game, v reflect.Value, i int) (name string, val interface{}) {
 	tFld := v.Type().Field(i)
 	vFld := v.Field(i)
 	typ := tFld.Type
 	word := unsafe.Pointer(vFld.Addr().Pointer())
 	ret := reflect.NewAt(typ, word).Interface()
+
 	if vFld.Kind() == reflect.Ptr && typ.Implements(tySpriter) {
 		obj := reflect.New(typ.Elem())
 		reflect.ValueOf(ret).Elem().Set(obj)
 		ret = obj.Interface()
 	}
+
+	if vFld.Kind() == reflect.Interface && typ.Implements(tySprite) && g.canBindSprite(tFld.Name) {
+		obj := reflect.New(g.typs[tFld.Name])
+		reflect.ValueOf(ret).Elem().Set(obj)
+		ret = obj.Interface()
+	}
 	return tFld.Name, ret
 }
 
@@ -338,6 +345,10 @@ func findObjPtr(v reflect.Value, name string, from int) interface{} {
 				word := unsafe.Pointer(vFld.Pointer())
 				return reflect.NewAt(typ.Elem(), word).Interface()
 			}
+			if vFld.Kind() == reflect.Interface {
+				word := unsafe.Pointer(vFld.Addr().Pointer())
+				return reflect.NewAt(tFld.Type, word).Elem().Interface()
+			}
 			word := unsafe.Pointer(vFld.Addr().Pointer())
 			return reflect.NewAt(typ, word).Interface()
 		}
@@ -483,7 +494,7 @@ func Gopt_Game_Reload(game Gamer, index interface{}) (err error) {
 	g := instance(v)
 	g.reset()
 	for i, n := 0, v.NumField(); i < n; i++ {
-		name, val := getFieldPtrOrAlloc(v, i)
+		name, val := getFieldPtrOrAlloc(g, v, i)
 		if fld, ok := val.(Spriter); ok {
 			if err := g.loadSprite(fld, name, v); err != nil {
 				panic(err)
@@ -589,6 +600,7 @@ func (p *Game) addStageSprites(g reflect.Value, v specsp, inits []Spriter) []Spr
 
 var (
 	tySpriter = reflect.TypeOf((*Spriter)(nil)).Elem()
+	tySprite  = reflect.TypeOf((*Sprite)(nil)).Elem()
 )
 
 // -----------------------------------------------------------------------------
diff --git a/sprite.go b/sprite.go
index c9218865..9b053e82 100644
--- a/sprite.go
+++ b/sprite.go
@@ -63,6 +63,9 @@ const (
 
 type Sprite interface {
 	IEventSinks
+	Shape
+	Main()
+
 	Animate(name string)
 	Ask(msg interface{})
 	BounceOffEdge()