The engine (also called the "interpreter") is what runs your game and is what the end player will use.

If you are using the default interface, then you use the right mouse button to cycle between the available 'modes', and the left button to use the current mode on the mouse position. You can also move the mouse to the top of the screen to bring up the icon bar where you can directly select a mode. To exit the engine, press Ctrl-Q. You can save your game position using F5 and restore with F7.

The controls described above work with the default setup; however, you can customize your game to use a different interface and shortcut keys.

In this section:

The demo game
Graphics driver selection
Run-time engine setup