Alien Syndrome Cheats

At the main screen, press Down and Start on the first controller, And press right simultaneously on the second one. Note that this only works for two players.

When playing a two-player game, if you come across a weapon that both of the players want, have them both touch the weapon at the same time. You'll both get it.

In the two player mode, steal lives from the other player after they die by pressing A and B.