GTA: Zombie Marathon
The world that we know is gone as it is field with flesh-eating zombies. The number of these zombies are increasing since they are infecting the people they have killed. Transforming them to zombies as well. You are lucky to made it this far, but your days are numbered. You need to fight for your life. The game is played with a mouse and a keyboard. You need to make sure that no zombies would reach you. Each kill would earn you money. You can use the money to buy some upgrades. The game would be harder and more challenging as you make some progress.