I love this game but am way tired of KILLING ppl in it so here is an out line of my fav game type right now. Its Block Tetris---Knockout.
One its all about who is standing when its all said and done, nothing else. Block means make some block, you will need to do this to put ppl out.

There are only two kinds of blocks solid or gold made with all of any one kind. BTW these are a four by four black no bigger or smaller. The other is a silver block and its made when you combine NE peices to make a 4by4 block.

Here is the site for Tetris.
http://www.thq.com/tetrisworlds/Feat...etris_Screen=1
Here is what they say.
Square Tetris

The objectives of Square Tetris are the same as Tetris, clear lines to earn points. In addition, the player gets a bonus for creating 4x4 squares ("Squares") out of the falling Tetriminos. Lines cleared that contain a piece of a Square earn big bonus points. A T-spin coupled with a line clear will cause certain blocks in the Matrix to fall ("Avalanche").
You can see a block in this pick.
I will post more about posible block combos later. Thanks