Zombie Concentration

Big Mike and his daughter Alice travel to a military base, Mike's old workplace. Unfortunately it is overrun with zombies and the two have to save their hide.

Zombie Concentration is a twin-stick shooter: one stick is used for movement and the other for shots (just pushing the stick in the direction already triggers the shot). The goal is to survive as long as possible on the non-scrolling map and accumulate enough points for an entry in the high score list. Besides the standard weapon, the heroes have a few other weapons to their disposal: laying mines (either TNT or poison) which are triggered by whoever walks over them as well as an airstrike which can be called in periodically. Over time they will face more than just the standard zombies, e.g. big ones which take a more shots. Killed enemies may leave useful things behind, e.g. ammo, special weapons (shotgun or assault rifle), dog tags (bonus points) or extra health.

If the game is played in co-op, the player can start the game with either Mike or Alice. Both have different abilities (Mike is slow and has much health, Alice the opposite) and weapons (Alice has a rapid-fire gun while Mike uses single shots).