When I first saw Bloxorz, my first thoughts were "How thrilling can moving a block around be...", three hours later I had my answer. I reached level 22 (of 33) before having to throw in the towel, foolishly I didn't make a note of the level's passcode so I couldn't start back at that level (be warned!).
The aim of the game is to get the block to fall into the square hole at the end of each stage, not nearly as easy as it sounds. Along the way you'll find plenty of bridges and switches to test your logic and try your patience.
If you like logic puzzles, you'll love Bloxorz. Just make sure you don't have to be anywhere for a while!