Switchblade

CHEATS

On the high score table, enter "POOKY". Use '1'-'5' to select level.

Another source seems to give more complete directions:

Enter your name as "POOKY" on the high score table then hold down either '1', '2', '3', '4' or '5' and click on `end'. Still holding down the key, start a new game and you will start on the chosen level.