Put in MJ?? to play with a partner, supposedly Jordan. Replace the ?? with any two numbers. Pause, hold down Option 1 and press Option 2. You can change the pause message to anything you want! (from Star*Lynx BBS)
Level 1-1 AAAA Level 3-3 IIII Level 1-2 BBBB Level 4-1 JJJJ Level 1-3 CCCC Level 4-2 KKKK Level 2-1 DDDD Level 4-3 LLLL Level 2-2 EEEE Level 5-1 MMMM Level 2-3 FFFF Level 5-2 NNNN Level 3-1 GGGG Level 5-3 OOOO Level 3-2 HHHH
Taken from January 1993 EGM (Edward Mann). Someone at Atari is very imaginitive.
These codes transport you to the beginning of each level with maximum power-ups and allow you to shoot at the hoop in any level:
Level 1-1: 999Q Level 2-1: PP9T Level 3-1: 9PPW Level 1-2: P99R Level 2-2: 99PU Level 3-2: PPPX Level 1-3: 9P9S Level 2-3: P9PV Level 3-3: 999I Level 4-1: P99J Level 5-1: 99PM Level 4-2: 9P9K Level 5-2: P9PN Level 4-3: PP9L Level 5-3: 9PPO
(from Deena Krutak in June '93 GamePro)