Press F9 to pause the game. Hold HELP, Left Shit,
and 1 (main keyboard). Let go of all three, and
press F10 to restart the game.
>From now on the following keys are activated:
1 - 5 (main keyboard) = Warp to corresponding level
F1 - F4 = Warp to section 1-4 in current level
If you are almost dead, just use the F1-F4 keys
(depending on how far you are) for renewed strength!