Left 4 Die

WASD - Move, Left Mouse button - Attack, R - Reload, SPACE - Jump, 1 - 4 - Select Weapons. You can approach the weapons dealer to buy weapons, the armour dealer to purchase armour, the barber to change your appearance, and the commander to receive a new mission. Complete missions and kill zombies to earn money and experience. The higher your level, the more powerful equipment and higher rewards for missions you can obtain, but you will also face more numerous hordes of zombies chasing you.