Y8.com offers a plethora of two-player games, and a couple of the most popular titles include "Mighty Knight 2" and "Box Head," as of 2015. For two players to play at the same time, one uses the arrow keys to move, while the other uses W, A, S and D.
In "Mighty Knight 2," players work together to fight an evil power. Players must slash and hack enemies using swords and magic spells to progress to higher levels. In "Box Head," players work together to destroy hordes of zombies invading their territory. As the zombies grow in number, players receive stronger weapons, such as Uzis and bazookas.