Unlock shirts as follows:
Acid: Win one game.
Ape: Get a turkey.
Bear: Win the Beginner Tournament.
Black Cat: Win the Intermediate League.
Brit Spot: Win the first Match Challenge.
Dead Acid: Win the Advanced Tournament.
Dino: Win the Beginner League.
Dog: Win the Expert Tournament.
Flames: Win the Amateur League.
Gray: Win the Medium Pin Challenge.
Heart: Win the Expert League.
Monkey: Win the Intermediate Tournament.
Peng: Win the Easy Pin Challenge.
Pig: Win the Championship League.
Puss: Win the Amateur Tournament.
Rainbow: Finish last place in League.
Roger: Win the Fiendish Pin Challenge.
Stars: Win the Championship Tournament.
Strike: Get a strike.
Sull Ball: Win five games in a row.
Ying Yang: Win the Intermediate Pin Challenge.
Added by: Team SuperCheats May 4th 2007, ID#26385