Tony Hawk's Pro Skater 2

Thin Skater
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Pause the game. Press and hold L, then press Left, C-Right,
Right, Down, C-Down, Up, Up.

Multiply Score by 10
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Pause the game. Press and hold L, then press C-Down, C-Down,
C-Down, C-Down, C-Up, Right, C-Right, Right.

Full Special Meter
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Pause the game. Press and hold L, then press C-Left, C-Down,
C-Up, Right, C-Right, Right.

Perfect Balance
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Pause the game. Press and hold L, then press C-Down, Right,
Down, C-Left, C-Down, C-Up, C-Right, C-Left.

Turbo Mode
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Pause the game. Press and hold L, then press C-Left, C-Down,
C-Up, Down, Up, Right.

Flight Mode
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Pause the game. Press and hold L, then press Right, Up, C-Down,
C-Up, C-Down, C-Left, C-Left, C-Right.

Stats to 10
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Pause the game. Press and hold L, then press Down, Up, C-Up,
C-Left, Down, Up, C-Up. submitted by IGN Guides

Stats to 13
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Pause the game. Press and hold L, then press C-Down, C-Right,
C-Right, C-Up, Up, Down, Right, Left.

Unlimited money
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Pause the game. Press and hold L, then press C-Left, C-Left,
Up, C-Right, C-Up, Down.

Unlock Double Moon Physics
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Pause the game. Press and hold L, then press C-Down, C-Left,
C-Right, C-Left, Up, C-Down, Down, Right, C-Down, C-Down.

Unlock Slow-Nic Mode
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Pause the game. Press and hold L, then press C-Up, Down, Left,
C-Left, C-Down, C-Up, C-Right.

Skip to restart
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Pause the game. Press and hold L, then press C-Left, C-Down,
C-Right, Down, C-Up, C-Up.

Simulation mode
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Pause the game. Press and hold L, then press Left, C-Right, Right,
Down, C-Down, Up, Up.

Super turbo mode
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Pause the game. Press and hold L, then press Down, Left, C-Up,
C-Down, C-Left, Right, Up.

Hints
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On the San Francisco level in Free Skate, at the starting point
go down the zagging hill and turn left to face the half-pipe against
the building. You'll have to work up some speed on that half-pipe,
once or twice should do the trick. Then once you've got your speed,
exit the pipe heading towards the hubba gap. You can jump the gap,
or pass under the bridge, and then you'll hit the quarter-pipe against
the next building. Go up the pipe, and then when you come down, make
a sharp (50-85 degree turn) to the left and jump off the curb boardering
the grass. You should be aiming for the red steel girders that has
six posts. If you land on top of it, come to a screaching halt on top
of it. Then perform a grind at one the edges of the structure. If you
do this correctly you'll be on the underside of the structure.
Movement will be limited to the area in that structure, and if you
want to get out and continue skating, just do an ollie near the edge,
and you'll hit your head on solid ground!

Open Gym Doors
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Go to the school level. grind the "opunsezmes" grind rail before the
timer gets to 1:40. The gym doors will open.

Bull Ring Glitch
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Go to "the way to go gringo" or the whole pipe next to the half pipe.
You could go in it or around it. Go to the hump in front of the whole
pipe. Now go around that hump as long as you want. This also works by
just going in a circle. Do this with out going into the air, olley,
bump up, or a ramp,etc. any way do this and go to the whole pipe.
Go up it. If you do it correctly you'll notice that it'll say "way
to go giringo". And under that you'll get lots of points.