Zombie Arena is a bare bones zombie shooter with 4 difficulties, tons of upgrades, 5 zombie types, mines, rage mode and more. See if your good enough to get a high score! Controls are as follows:
AWSD keys to walk around, Mouse to Aim and Shoot, Space to drop a mine, Shift to activate rage, P to pause.
Thats about all you need to know, have fun guys!
Update: Made the shots hit the zombies more accurately, so you'll still hit the zombies when they're very close.