Red Ace:
Win the game in arcade mode under the hard difficulty setting as a male character with no losses. Select exhibition mode and move past Rafter on the character selection screen to access Red Ace.

Hitomi Yoshino:
Win the game in arcade mode under the hard difficulty setting as a female character with no losses. Select exhibition mode and move past Rafter on the character selection screen to access Red Ace.

Ultimate difficulty:
Successfully complete time attack mode under the hard difficulty setting.

Hint: Effective smashing:
When you are standing below the ball and waiting for the smash hit opportunity, your opponent will run to the other side of his court. After he/she does this, aim your smash for the side that player was just on and you will have about a 90% chance of scoring.

Hint: General tips:
Always hit the ball where your opponent is not, to keep him/her on his/her feet. You will also have a better chance of scoring if you hit the ball away from your opponent.

Do not assume anything. When your opponent is about to hit a deep shot, stay in the center of the court so you can reach a ball that is hit to either side.