Tetrollapse is basically a Tetris clone with the twist that there are different colored blocks that when you remove them you move on to the next level. This little game can get a little frustrating because like Tetris you do not always get the blocks you need when you need them.
The one downside is that there are ads between the levels in this throws the directional keys to the full page rather than the game window. This creates the problem that you need to switch the focus back to the game window while the blocks are coming down. However, it does keep you on the same level when you restart the game. If you like Tetris clones Tetrollapse be loads of fun.