Zack, Carrie, Andy, and Jennifer were all looking forward to a party when Zack's parents left town for vacation. Unfortunately, some uninvited guests soon arrived..."

4-Player Cooperative Online Action
Mix local & online players as you try to survive the Monster's invasion. Each player character has unique items and affects how the story plays out.
3D Top-Down Shooting
Aim in any direction, including up and down. Hordes of Monsters attack you from all sides, but you can also utilize quick dodge-moves to avoid them!
Customize Your Weapons
Acquire Weapon Parts by defeating enemies and exploring your environments, and then use these parts to Build more powerful weapons and Upgrade the ones that you have. Carry these customized Weapons between games, and find rare Weapon Parts at the greater difficulty levels to build the Ultimate Weapons!
Drive Vehicles
Find abandoned Vehicles, outfit them with deadly weapons, and ride in them to overpower your foot-bound foes.
Save the Town
Fight your way through 5 unique environments, such as "Suburban Nightmare", "High School Hell", and "The Shopping Maul", each with deranged Boss Monsters. Take back your turf from these evil fiends (and maybe impress your girlfiend while you're at it)!