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ESC - pauses the game, any key to continue
CTRL+J - choose a joystick control. The game will be calibrated anew for the joystick
CTRL+K - choose a keyboard control
CTRL+R - end the game and return to the title sequence
CTRL+A - starts the game from the beginning of the current level
CTRL+S - the sound will be switched completely off. To switch it on again, same key combination
CTRL+G - save the current game on HD
CTRL+L - press it during the intro sequence to load a last saved game
CTRL+Q - quit the game and return to Dos / Windows / DosBox
SPACE-button - shows, how much time remains yet

Have fun yet.