Stadium selection:
Press Left or Right when the NFL flag is next to the rotating stadium in the options screen. One of the four stadiums may be selected for the game.

Codes:
Enter one of the following controller actions at the team selection screen in pre-season mode:

Effect	Code
Constant turbo	X(2), Y(2), X, Y
Fumble mode	X(3), L, X(2)
No fumbles	X(3), R, X(2)
Land mine mode	X(3), Z, X(2)
Super slippery	X(2), R, Z, X, R
Big players	X(2), Z, Y, X, Z
Small players	X(2), Z(2), X, Z
Short, fat players	X, Y, Z, Y, X, Z
Tall, skinny players	X, Y, Z(2), X, Z
Shadow players	X(2), Z, L, X, Z
100 yard passes and kicks	X(2), Z, R, X, Z
High school team	X(2), Y, R, X, Y
Super team	X(2), R, Y, X, R
Eight downs	X, Y, L, Y, X, L
Activate all codes	X(2), R(2), X, R
Activate 100 secret teams	L, Y, R(2), L, R
Pro-Bowl teams	X(3), Y, X(2)
Very slow motion	X(2), L, Z, X, L
Very fast motion	X(2), L(2), X, L
Vikings vs. 49ers	X, Y, L(2), X, L
Gamepro team	X, Y, L(2), X, L
EGM team	X, Y, R(2), X, R