At the main menu, hold R2 and press X, Triangle and Square. If you entered the code correctly, you will hear a whistle.
How To Make It Hard To Hit Free Shots
When playing 2 player mode first foul a player. Then wait until the clock says 01 then hold the anolog sticks all the way up. It will make your oppenent lose concentration and will miss 98% of the time.
Unlockable: All-Time Greats
Select the All-Time Great player you want, hold L1 + L2 + R1 + R2 and hit CIRCLE + SQUARE.