Pitfall

Try entering these codes:
meowmeowlikemeowman : 9 lives
eatmorebran       : 9 continues
pumpyouup         : 99 of each weapon
fiveeasypieces     : skip first 5 levels
idbuythatforadollar : Access any level
letsdothetimewarp   : Atari level warp
hatman           : Silly!
iddqd           : Meet the makers
framerate         : Guess.