Zombie Massacre 3

Use the arrow keys (or WASD) to move.

Click on the coloured boxes at the top of the screen to purchase items, ammo and upgrades (hotkeys work too).

You can buy a laser sight add-on for all your guns for $1000 which boosts damage by 20% (Note: Not for old PCs)

Move the crosshair over the zombies using the mouse to automatically attack them.

Click the reload button for a manual reload.

Alternatively, let the clip count reach 0.