Coloid

A very difficult push-the-blocks brain-teaser. You must push all the matching letters together -- destroying them in the process -- but your selection box can only change direction when it hits a wall or lands on a letter...so the more letters you collide, the fewer opportunities you have to navigate the board and select other blocks.

Nicely done. Maybe there's a trick to solving these puzzles, but otherwise this game is for geniuses only!