At the versus screen, press Turbo, Shoot, and Pass to change the icons on the bottom of the screen. The numbers in the following list indicate the number of times each button is pressed. After the icons have been changed, press the D-pad in the indicated direction to enable the code. If you entered the code correctly, you will see the name of the code and hear a sound. For example, to enter 1-2-3 Left, press Turbo, Shoot(2), Pass(3), Left.

Note: More then one code may be activated per game.
Note: Two player agreement required.

Result - Code
Infinite turbo - 3-1-2 Up
Beach court - 0-2-3 Left
Street court - 3-2-0 Left
Home uniform - 0-1-4 Right
Away uniform - 0-2-4 Right
ABA ball - 1-1-1 Right
Granny shots - 1-2-1 Left
Show shot % - 0-1-1 Down
Show hotspot - 1-1-0 Down
No goaltending - 4-4-4 Left
No fouls [Note] - 2-2-2 Right
No hotspots [Note] - 3-0-1 Up
Big heads - 3-0-0 Right
Tiny heads - 3-3-0 Left
Tiny players - 5-4-3 Left

In order for this cheat to work you must press turbo 5 times, then press the pass button 4 times, and then press shoot 4 times and you will be able to play as Dr. Atomic.