Insanity. Don't even bother with this game if you plan on beating it. A Game Genie won't help either.
I like beat em ups every here and there, but once you get into the game fully, you'll notice that it's a small part of it. After the first and probably easiest level in the game, it takes you from hoverboards to racing to platforming, mixing it up each time.
However, you will eventually learn HATE this game to no end. Not that it's bad, its just TOO HARD!!!! Don't beleive me? Get to the motorcycle-esque level. You'll be slamming into walls and falling into pits faster than it takes to finish a microgame from any Wario Ware title!
What's next? A roller coaster-type level...Where a rat chases you with a saw and will automatically kill you and have you start over AGAIN if he collides with you!!
And even if you don't heed my warning, KNOW THIS: 2-Player mode makes it MUCH worse (when your buddy dies you BOTH have to start over!!!), and infinite lives will just prove how impossible the game really is ("Gotta make sure I hit that ramp!" BOOM! You smash right into a wall from Rare's sadistic little trick.
To end my ranting, I'l give you this advice if you want to beat this game. Buy it somewhere and then get a rom and emulator for it. (No worries. Its 100% legal to own a rom of a game that you own in real life.) Try ZSNES, you can actually rewind gameplay to fix the numerous mistakes you'll make, and even put the game in REAL slow motion (not taping the pause button like many old school controllers did.)