WCW Nitro

Go to the title screen and press the following button combination:
Note: If the code is accepted, you should hear a sound.

Unlock all 48 wrestlers: C-Right(4), C-Left(4), R(4), L(4), Z.
Giant head mode: C-Right(4 tiems), C-Left, C-Right, C-Left, C-Right, Z.
Select any rings: C-Left, L, C-Right, R, C-Left, L, C-Right, R, Z.
Swelling heads: C-Left(7 times), L, Z.
Big head mode: C-Right(7 times), R, Z.
Big heads, hands, feet: R(7 times), C-Right, Z.

Unlock single set of wrestlers and 3 hidden wrestlers:
R, L, C-Right, C-Left(2), C-Right, L, R, Z. After got to the
wrestler selection screen, highlight a character and hit
C-Left, C-Right, L, R, C-Left, C-Right, L, R, Z.

Alternate ring select
Go to the options, hit C-Right, R, C-Right, R, Z. Note: If the code
is accepted, you should hear a sound. Hit Z to advance to the next
ring in the series. To move in reverse, hit
C-Left, L, C-Left, L followed by Z.

Big hands
Hit L(7 times), C-Left(17 times) at the mode selection screen.

YMCA dance
Start a match in the Disco ring and hit B