Press  F9  to  pause the game. Hold HELP, Left Stuff, 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!