You have eight rooms to choose from to fight the zombies and try to stay alive as long as possible. You get more weapons and upgrades with the more zombies you elimiate. Watch out for the red devils, they are tough and they shoot back.
Have a Blast and Sharpen the Mind! You've never had this much fun combining strategy, concentration, and basic adding. Clearing the board may seem easy to start, but given the limited moves or the ticking clock, you'll have to stay sharp and look for the best spots to eliminate all the tiles you can.