Tony Hawk's Underground 2: World Destruction Tour Cheats

Glitch: Super-Fast Multiplier
You need Infinite balance, "straightedge".Start a liptrick w\a Nose Stall and multiply as much as possible. Jump off and Land in an Invert(DOWN + ^)
and the multiplying speed is doubled! yes doubled! you can revert and do this all over again.

And thats how you can get massive scores.