ALT+F4

...But the best part was this: No way to exit the game. Pressing Escape in the Main menu started a promotional video which after it finished went to the main menu again. Then, after thinking and clicking around a bit, I tried ALT-F4, the standard windows combination that even still some C++ developers don't know (trust me), a 'Do you really want to exit the game' menu appeared. Didn't they want people to exit their wonderful game? Strange.

— http://www.irrlicht3d.org/pivot/entry.php?id=941

Выделено мной.

Дожили...