To enter the codes, go to the options screen, select "Codes" and enter the code.
Repeat the code to disable its effect.

 Effect:                   Code:
------------------------------------------
 Unlimited turbo:          CARDIOMAN
 Little players:           SMALLSHOES
 Disable trade rules:      GIMMETHAT

 More three pointers:      THREE4ALL
 More alley-oops:          IGOTHOPS

 Chicago rooftop court:    WINDYCITY, then start an exhibition game

 ABA basketball:           OLDSCHOOL
 WNBA basketball:          GOTGAME
 Soccer ball:              HOOLIGAN
 Volleyball:               SPIKEIT
 Beach ball:               SANDINMYSHORTS
 8-ball:                   GAMEOVER
 Xbox ball:                BACHMAN