If you push B once you will jump. Push it twice and you will do a super jump.
This code for Spy Kids: Challenge, doesn't work for the last level, but it works for the first two. If you hold down...SELECT,A,B,R,L. This will put up a screen that will allow you too choose infinite lives, unlimited spring shoes, unlimited fuel for the jetpack, and much more cool gadgets. You have to hold them all at the same time though, or it wont work.