Siege

Its a co-op only tower defence game, in which hordes of enemies run at the castle wall and the players need to keep them away. The players have a range of weapons, most work on all enemies, but some enemies can only be killed with a specific type of weapon. Some weapons need team work to use them. Most weapons get there ammo from downstairs, over a narrow stairs that allows only 1 player at a time. Enough gameplay elements to make this game frantic, and we have seen some teams shine when they had clear communication.