Eye In The Sky is an very unusual two player coop action rpg.
The unconventional weapon is a magnifying glass. It is also what you see the game through; the dungeon, the avatar and the monsters are all tiny (ant size, really) and need magnification. Its like playing in a mini-map :)
Both players use the same controller, at the same time. Any XBox-like controller will do.
Player One controls Guy the Unlucky, a cursed adventurer lost in a dark dungeon. Player Two controls The Eye, an ancient artifact bound to Guy the Unlucky. Guy depends on the Eye for protection and light. The Eye depends on Guy to pick up ammunition for its deadly ray.
It can be played solo, but you'd be missing out on the experience. So whip out your controller, grab a friend and give it a try :)