Faster runningbacks
Enter "TURBOTIME" at the code entry screen. Then while playing the game, press A to run faster.

Tomato quarterback
Enter "SPLAT" at the code entry screen.

Dancing referee
At the coin toss screen, press B(2), A, C-Up.

Always win coin toss
At the coin toss screen, repeatedly press Start.

Pass automatically
Press A to snap the ball, then wait without pressing any buttons or directions. The quarterback will automatically throw a pass to the receiver that is most open.

High step into the endzone
Get within 10 yards of the endzone and press Jump (default is C-Up) to high step if there is enough room between the player and any defenders.

Random stadiums
At the stadium selection screen, press R or Z.