| Move forward / back | W / S or Up / Down arrows | The Fwd and Back buttons |
| Turn left / right | Left / Right arrows (a tap is a small nudge, holding turns faster) | The Turn buttons, or mouse look: click the view, then move the mouse |
| Strafe (step sideways) | A / D or , / . | The Side buttons |
| Fire | Space or Ctrl | The Fire button, or the left mouse button with mouse look |
| Use: doors, locked doors, secret walls | E or F | The Use button (walking into a plain door opens it too) |
| Pick a weapon | 1 to 5 | — |
| Next weapon | Q | The Gun button |
| Automap | Tab or M | — |
| Let go of the mouse | Esc (also pauses) | — |
| Start or play again | Enter | Start game, or tap the view |
| Pause or resume | P or Esc | The pause button above the view, or Choices → Pause |