Crack Down
Crack Down -- Template:AL-US Gold
While playing, pause game and type SMURF, then press F1 or F2 for unlimited lives for player 1 or 2 respectively.
Also, press P to pause, enter REVENGE OF THE MENTAL MOONMEN, press 1 to get 999 lives, then press P to resume playing. If it doesn't work, try it without spaces.
(testing needed to see which method of the latter entries works)