Tony Hawk Pro Skater 2

Full stats:
Pause the game, then hold Numpad 7 and press Spacebar, V, B, C, V, Up, Down to raise your skater's attributes to 10 (if you entered the code correctly, the pause screen will shake).

Secret level:
To enter secret level (neversoft land) pause game and hold L1 and press O, X, square, O, X, quare, then quit game and go to level select screen and select neversoft land.

Blood mode:
Pause the game, then hold [Numpad 7] and press [Right], [Up], C, V to toggle blood mode (if you entered the code correctly, the pause screen will shake).

Big head mode:
Pause the game, then hold [Numpad 7] and press C, B, [Up], [Left](2), C, [Right], [Up], [Left] (if you entered the code correctly, the pause screen will shake).

Fat skater:
Pause the game, then hold [Numpad 7] and press [Spacebar](4), [Left], [Spacebar](4), [Left], [Spacebar](4), [Left] to make your skater fat (if you entered the code correctly, the pause screen will shake.
This code may be entered multiple times to continue making your skater more fat).

Thin skater:
Pause the game, then hold [Numpad 7] and press [Spacebar](4), C, [Spacebar](4), C, [Spacebar](4), C to make your skater more thin (if you entered the code correctly, the pause screen will shake.
This code may be entered multiple times to continue making your skater more thin).