0 Day Attack On Earth is a dual-stick shooter from Square Enix that was released on Dec. 23, 2009 for 1200 Microsoft Points (15 USD).
A multiplayer overhead shooter from Square Enix, 0 day utilizes satellite imagery from 3 cities, Tokyo, Paris and New York to make the environments found in the game. The cities are walled off heavily to make de facto arenas for the gameplay to occur in. Along with single player modes (where you are also given 3 AI assistants), 0 day also includes online co-op for up to 4 players, and a versus mode for up to 8 players , where you compete in Control Point or CTF matches.