Play as Master:
Defeat Master in Singles in Arcade mode to unlock him in Arcade and Ttraining modes.

Play as King:
Beat all 22 trial and 24 training levels in world circuit mode to reach the number one ranking and have King challenge your player. Defeat King to unlock him in arcade and training modes.

Unlock the Sunflower Costume:
Beat the big wall training level with at least 10 seconds left on the timer.

Unlock the Tambourine Costume:
Beat the bull's-eye training level with a score of at least 7000.

Unlock the Camoflauge Costume:
Beat the cannon training level with at least 15 seconds left on the timer.

Unlock the Zebra Costume:
Beat the the smash box training level before the timer turns red.

Unlock the Giraffe Costume:
Beat the drum shooter training level before the timer turns red.

Unlock the Fire Suit Costume:
Beat the big wall training level before the timer turns red.

Underarm Serve:
To do an underarm serve, press A + X + Down while at bottom half of court, or A + X + Up while at the top half of court.

Fire Suit Costume:
Beat the big ball training level before the timer turns red to unlock costume No. 28.

Game Shark Codes

Infinite Funds      A33B5C71

Unlock Tinbergen    2F97635E

Unlock Euler        59E7774C

Unlock Tesla        AF23518A

Unlock Altman       D1C883C4

Unlock Singth       30C1245C

Unlock Costa        6DDB6B5A

Unlock Ventura      BF763A96

Unlock Inoue        FF49969D

Unlock King         5957774C

P1 Quick Win [Note] 900806E6

P1 Never Win [Note] 900806E6
 
P2 Quick Win [Note] EE371485

P2 Never Win [Note] EE371485

Note: Do not use this code in the training levels.