| ←↑↓→ | move (8-way stick) |
| space | fire |
| 5 / 6 | coin, slot 1 / slot 2 |
| 1 / 2 | 1 or 2 player start |
| P | pause |
| M | sound on / off |
| + / − | zoom |
| E | engine: ROM or JavaScript (restarts) |
| A | self-playing AI (JavaScript version only) |
| F2 / 9 | test switch (resets the board) |
| G | joystick / gamepad setup |
| ? | this help |