Tony Hawk's Underground Cheats (GameCube)

When skating in Manhattan, it is possible to ride in the back of the DC trucks driving
around the city. Skate behind one and jump into the back when you get a chance. Doing so
will allow you hitch a ride around the block.

Successfully complete story mode on the sick difficulty setting to unlock T.H.U.D.
Note: In the Neversoft FMV sequence at the start of the game, the boy that gets
eaten is Eric. The thing that pops out to eat him is T.H.U.D.

In the Moscow level, find the place where there are a lot of tanks and a building that
reads "AEHNH". Stand in front of the building to the left. Line your self with the brown
ledge. Climb up it. Stand on the brown ledge that you are about to grind on. If you are in
the correct location, to your left should be a tree and straight ahead should be a big red
building palace-looking thing. Grind that ledge and jump toward the previous viewed
window. You should go down a ramp. Where the ramp is located, is a ramp that goes up on
the right, revealing the "Tony Hawk 2" icon as you went down the ramp to unlock the Hangar
level from Tony Hawk's Pro Skater 2.

From the large hotel you start at in the Hawaii level, follow the main road all the way
around in either direction. When you find the strip of buildings that are opposite on the
map from the hotel, you will find a large tiki head. Alternately, go out the front doors
of the hotel and through the plaza all the way out the other side. Jump inside the tiki
head's mouth to find a secret area. Skate down the tunnel until the end and boneless into
the air to grab the "Tony Hawk 2" icon to unlock the Venice Beach level from Tony
Hawk's Pro Skater 2. Note: Think of the map as a square. If the beach is at the
bottom, the tiki head is on the top side of the map. It is much easier to get inside the
tiki head's mouth if you dismount your board first.

Climb the hotel that you start at. Get to the roof and to the right of the pipe on the
right is the side of the building. Grind that ledge onto the wire to get the secret tape.

Successfully complete story mode on the beginner difficulty setting to unlock Iron Man.

Find the Go-Kart. Drive the Go-Kart around until you find a huge ramp that goes over the
center of the level. Drive off it as fast as possible and you will clear a gap that gives
you 10,000 points.

Select "Cheat Codes" at the options menu, then enter "letitslide" as a code.
Alternately, get all 129 goals.

Successfully complete story mode on the normal difficulty setting to unlock Gene Simmons.

Successfully complete story mode twice or complete sick mode to view an alternate ending
sequence.

Select "Cheat Codes" at the options menu, then enter "noforce" as a code.
Alternately, get all 129 goals.

Do either a manual or a nose-manual, and press Left, Right, B to Spacewalk. This is useful
on missions where you can only manual, such as the one in Moscow with the reporters.

Select "Cheat Codes" at the options menu, then enter "keepitsteady" as a code.
Alternately, get all 129 goals.

Go to the small building to the left of the cop car. Climb up the wire that is heading
towards the tall building. The tape is in between the gap of the building at the top.