You can enter any of the codes below to unlock the corresponding function:

Key:

0 = Basketball
1 = NBA Trophy
2 = NBA Jam Logo Basketball
3 = NBA Logo

Unlockable anytime...

ABA Ball 0-2-0
Child's Play (only in exhibition mode) 1-1-1-Left
Challenging Mode 1-1-1-Up
No Replays 1-0-0-Up
No Fire 1-0-0-Left
Show Shot % 1-0-0-Down
Tournament mode 1-1-1-Down

Unlockable later...

80's Filter 0-0-3-Right
Big Heads 2-0-0-Right
Beach Ball 2-0-1-Up
Chain Nets 2-0-1-Down
Constant Hotspots 3-1-2 Up
Iguana Gymnasium 0-1-0 Up
No Hotspots 3-1-2 Down
No 2-Pointers 1-2-2 UP
No 3-Pointers 1-2-2 Down
No Goaltending 1 -2-2 Right
Powerup Team 0-0-0 UP
Powerup Team 3 Pt. 2-2-2 Up
Powerup Team Dunks 2-2-2 Down
Powerup Team Blocks 2-2-2 Left
Powerup Team Dribbles 2-2-2 Right
Powerup Team Rebounds 2-3-2 UP
Powerup Team Strength 2-3-2 Down
Powerup Team Speed 2-3-2 Left
Powerup Team Steals 2-3-2 Right
Retro Celtics Arena 0-1-0 Down
Retro Lakers Arena 0-1-0 Left
Retro Bulls Arena 0-1-0 Right
Rucker Park 0-1-1 Left
Venice Beach 0-1-1 Down