I recently played this game for the first time... holy shit, this game is awesome playing 2 players. Kind of like a cross between a shooter and a puzzle game - you have to make chains of explosions by shooting down the monsters (each monster has different HP, indicated by their color), and by making large enough chains you will be able to send some firepower down at your opponent. I played for the first time at Otakon and I was seriously hooked. I need my own copy BAD but the dealer's area was all sold out
