Bloxorz - Can you get a rectangular cube into a square hole?
http://www.addictinggames.com/puzzle-games/bloxors.jspBloxorz is a game that is 33 stages. You get a block and move it into a square hole and you can't fall down or you die and start the stage over
Don't forget to write down your stage level, so you can continue from the last level you stopped at.