Tecmo Super Bowl

Sound test:
Hold B and press Left at the title screen. Press Up or Down to select a sound.

Control coin toss:
If the CPU selects "Heads" during the coin toss, quickly press B before it decides whether to return or kickoff. If done correctly, the CPU will always kickoff to your team.

All Buffalo play-offs:
Make sure that one team does not clinch a division title until after the last game in the 17th week of the season. When the game ends, a screen with the winner of the division title will appear. Reset the NES while that screen is displayed. The play-offs should show Buffalo both in the NFC and AFC.

Hint: Avoiding tackles:
Note: This runner's maximum speed must be above 13 for this trick to work. Get past all the defensive players. When your player is close to being tackled, start moving up or down while still running toward the endzone. When the defense is just about to tackle your player, or he is about to step out of bounds, start moving in the opposite direction. The defense should slow down and have to catch your player again. Repeat this until you score a touchdown. Note: Depending on the situation, this code may not always work.

Hint: Always get extra points and field goals:
Repeatedly press Kick before the extra point screen appears. Keep pressing Kick when the kick screen appears to kick the ball and always get the extra point. This may also be done for field goals.
Information in this section was contributed by asmith007.

Hint: Controlling the direction of kickoffs:
Hold Up while kicking off and the ball will go to the top of the screen (kicker's left). Hold Down while kicking and the ball will go to the bottom of the screen (kicker's right). If you do not hold any direction, the ball will go to the middle of the screen. Kicking to either side allows slightly more time for your defenders to reach the returner. This does not work for punt kicks. It is only effective for kickoff and safety kicks.
Information in this section was contributed by KeithAJohnson.