从易到难到抓狂

软件简直太棒了，但是如果可以提供纯粹的沙盒那就更好了
Its a fun game! The gui is nice and smooth. I definitely will introduce it to my friends. If it can provide sandbox mode that will be even great!

啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊诶 about Euclidea