직소퍼즐
드래그 앤 드롭 | Android 개발자 | Android Developers
https://developer.android.com/guide/topics/ui/drag-drop?hl=koVanilla Javascript (drag & drop )퍼즐 Puzzle 게임 만들기 - YouTube
https://www.youtube.com/watch?v=iTBZdg7tg-wHTML5 직소 퍼즐 - CodeProject
https://www.codeproject.com/Articles/395453/Html5-Jigsaw-Puzzle