Pause the game, then press the function key from 'F1' to 'F10'.
Press the 'ESC' key to skip levels. 
23:14:09
16-BIT. 100 % HERZ // KICKSTART 3.1 // WORKBENCH LOADED
Pause the game, then press the function key from 'F1' to 'F10'.
Press the 'ESC' key to skip levels.