The Rules: This game is like tetris except that blocks of DNA bases (A, T, G and C) are used instead.  To eliminate a row, simply make a row of matching base pairs.  So A pairs with T and G pairs with C.  Also, you may use to eliminate a block on the top. 

Controls:  Use cursor keys to control block movement and change block orientation:

move the block right

move the block to the left

flips the block upside down

That's it.  Have fun!

Things to add in the future:

• block mutations, eg. A->G
• sound effects
• more complicated shapes