The game may sound incredibly scary, but it's actually based on the upcoming animated movie of the same name from Dreamworks. Monsters vs. Aliens releases this week for the Xbox 360, PlayStation 3, PC, Wii, and PlayStation 2 and all versions feature a local co-op option with drop-in and drop-out support.
A second player can pick up a controller and drop in at anytime as Dr. Cockroach, Ph.D. As the most brilliant scientist in the world, players can blast and beam away enemies with tricky gadgets, plus reach hard to access places that only the smartest of cockroaches can get to.
Sounds like this could be a solid co-op game to play with your kids. The versions range in price from $19.99 for the PC to $49.99 for the 360/PS3/Wii. You can order your game at Amazon and support Co-Optimus.com!