Pendulumania is an incredibly fun and original freeware game, as inventive and simple as Tetris, but shorter and more engaging games requiring good mouse control.
1. The website is in Japanese which I can't read, with hardly any English. I don't know the actual terms of the freeware. See here: http://jn.swee.to/cano/
2. Is not compatible with Vista or Windows 7. Not sure if there is a workaround.
3. Even some of the text of the game menus reads as all question marks if you don't have the proper language support packs installed. I don't.
Given all that, you may ask, "Why bother?"
Well if you play it a bit to grasp the game, then you will understand. Plus, the game us under 1 megabyte.