| W A S D | Move / strafe |
| ← → | Turn (or move the mouse after clicking the view) |
| Ctrl / F / click | Fire |
| Space / E | Open doors · use the elevator switch to finish the level |
| 1–4 | Knife · Pistol · Machine Gun · Chain Gun |
Find the elevator switch (a lever on the wall) to complete each level. Grab the gold and silver keys to open locked doors.