The aim is to destroy your opponent’s tower with your own tower of weaponised blocks. Using familiar (read: exactly the same as) Tetris shapes you must create same-coloured squares (4×4, 8×8 etc) which will then convert into a weapon. There are different weapons or shields for each colour. Blue is a shield and protects the next square along, red fires rockets, purple a laser, orange repels enemy missiles with ping pong bats, green launches little drills and even more weapons await you in the later levels. These weaponised squares can be powered-up by making the squares bigger by adding extra blocks, a bit like Lumines.