It is Tetris, I'm not gonna review tetris since everyone know what it is. There is a lot of mode sure but most of it is just "make the board bigger" or "you only able to play with 1 kind of block.
I encounter some bug while playing. The game crash on me 2,3 times. The blocks are not clearing after I've fill all of one line (you can reproduce this by playing big mode and put block down to fill the bottom, it will clear 2 line on top but not 2 in the bottom).