Tower Bloxx is not a pure one-switch game - but once a "Quick Game" is clicked on it's (mostly) just SPACE or left mouse click to drop blocks. Quite a lot of skill is needed with this timing based tower building game, but if you do get the knack of it - it's addictive fun.
There is a commercial 3D version from Digital Chocolate, Tower Bloxx Deluxe, but I found this crashed badly on my laptop once I'd paid for it and presently won't work at all. Meanwhile - there's an alternative version of Tower Bloxx over at DiggyGames.com that is worth a play.
Via: Hybrid Arcade