To make these code work here is how it works : Press L to add numbers on the left side. Press R to add numbers to the center and Press the A Button to add numbers on the right. Then hit on the D-Pad whatever the last button is.

Allow out of bounds: 2-1-1 LEFT
Always QB: 2-2-2 LEFT
Always receiver: 2-2-2 RIGHT
Arctic Station: 0-3-4 DOWN
Armageddon team 5-4-3: RIGHT
Auto-Passing icon: 0-0-3 UP
Big feet: 0-2-5 LEFT
Big heads: 2-0-0 RIGHT
Big head teams: 2-0-3 RIGHT
Bilders team: 3-1-0 UP
Brew Dawgs team: 4-3-2 DOWN
Central Park: 0-3-3 RIGHT
Chimp mode: 0-2-5 UP
Chrome ball: 0-3-0 DOWN
Classic ball: 0-3-0 LEFT
Clear weather: 1-2-3 RIGHT
Crunch Mode team: 4-0-3 RIGHT
Disable Auto-Passing icon: 0-0-3 DOWN
Extra time: 0-0-1 RIGHT
Extra play for offense: 3-3-3 DOWN
Faster running: 0-3-2 LEFT
Fast passes: 2-4-0 LEFT
Ground fog: 2-3-2 DOWN
Gsmers team: 5-0-1 UP
Huge heads: 1-4-5 LEFT
Midway team: 2-5-3 RIGHT
More code entry time: 2-1-2 RIGHT
More fumbles: 3-4-5 UP
Neo Tokyo team: 3-4-4 DOWN
No CPU assist: 0-1-2 DOWN
No first downs: 2-1-0 UP
No highlighting receivers: 3-2-1 DOWN
No interceptions: 3-5-5 UP
No punting: 1-4-1 UP
No random fumbles: 5-2-3 DOWN
No replays: 5-5-4 RIGHT
Noftle mode: 3-2-5 UP
Power loader: 0-2-5 RIGHT
Power-up defense: 4-2-1 UP
Power-up Linemen: 5-2-1 UP
Power-up offense: 4-1-2 UP
Rollos team: 2-5-4 UP
Show more field: 0-2-1 RIGHT
Showtime mode: 3-5-1 RIGHT
Smart CPU teammates: 3-1-4 DOWN
Super Blitzing: 0-5-4 UP
Super field goals: 1-2-3 LEFT
Tournament mode: 1-1-1 DOWN
Training Grounds: 0-3-5 UP
Unlimited turbo: 4-1-5 UP
Weather Rain: 5-5-5 RIGHT
Weather Snow: 5-5-5 LEFT