WASD move   SHIFT sprint   SPACE jump
MOUSE aim   CLICK shoot   R reload   ESC pause
1 katana   2 rifle   3 machine gun   4 rocket launcher   5 sniper
Hold RIGHT CLICK to scope with the sniper — it pierces up to 3 zombies per shot.
Headshots deal double damage. Hold click for full-auto on the LMG.
Zombies drop medkits & ammo crates — walk over them. A boss rises every 10 waves.
Press B to spend 500 points on an AI squadmate (max 3) who fights beside you.