During play enter any of the following sequences (Press the keys - do
not hold them):

Press 'F1', 'UP CURSOR', 'DOWN CURSOR', 'DEL', and type "ILMVS" for
infinite lives.

Press 'F2', 'TAB', 'SPACE', 'F6', and type "RMADL" for infinite bombs.

Press 'F3', 'W', 'O', 'M', 'CTRL', 'X', '4', 'Y', and 'LEFT ALT' to
enable level skip.  Now press 'ESC' to skip levels.