Smash Court Tennis 3 Codes -

Very Hard difficulty:
In Challenge mode, successfully complete an opponent in the Training section in Hard mode to unlock the Very Hard mode.

In Challenge mode, successfully complete an opponent in the Mini-Game section in Hard mode to unlock the Very Hard mode.

Successfully complete Arcade mode in Hard mode to unlock Very Hard mode for Arcade mode.

Alternate costume:
Successfully complete Arcade mode to unlock a fifth outfit for that person in Arcade mode.

Galaga Tennis Racket:
Win the U.S. National Open Grand Slam on the second year running, with Hard mode of Galaga Tennis unlocked. You may now purchase this racket at the Pro Tour Shop for 18,000 points.

Pac-Man Tennis Racket:
Complete one year of Pro Tour mode with two Grand Slam Titles (Lyon and Australian Open) won, with Hard mode of Pac-Man Tennis unlocked. You may now purchase this racket at the Pro Tour Shop for 18,000 points.