Secrets at the end of the game
At the beginning of THUG when you start story mode you have a choice of which difficulty level you want to do.
Don't do too easy mode because it's way too easy and not as fun to do. When you do normal mode you have some different goals. After you beat the game in normal you unlock Iron Man.
His stats are at full. In medium when you beat the game you unlock Iron Man and Gene Simmons, the guitarist in the band KISS with the Ax guitar. Now sick mode is very hard. You have to be very good at the game to beat this one. If you do beat it you unlock Iron Man, Gene Simmons, and the THUG Monster that you see at the beginning of the game. The sick mode is very hard to beat.
Secret Hint:
You can also unlock levels from THPS2. You have to find the hidden tickets. One of them is in the evil tiki in Hawaii. Get off your board and try to jump into his mouth. The ticket is in there. Another ticket is in Jersey. Go to the train station. Get on top of the station. Look over on the other side of the station (where the track is)and look toward the ramps on the left side. You will then see the ticket. I hope these help you.
We have more cheats and tips for this game here, Tony Hawk's Underground cheats
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