New Play Control! Mario Power Tennis

Win the Flower Cup tournaments in doubles mode.

Complete the indicated task to unlock the corresponding bonus.

Bowser and Bower Jr.'s painting: Complete Diddy Kong's painting within the time limit.
Diddy Kong's painting: Complete Luigi's painting within the time limit.
Luigi painting: Complete Mario's painting within the time limit.
Yoshi's painting: Complete Bowers and Bowser Jr.'s painting within the time limit.

Complete the indicated task to unlock the corresponding bonus.

Super Panic level: Complete the Panic level.
Ultra-Hyper Panic level: Complete the Super Panic level.

Win the Special Cup Fire tournament in singles mode.

Complete the indicated task to unlock the corresponding bonus.

Famished Chomp level: Complete Hungry Chomp level with the highest score.
Hungry Chomp level: Complete Perkish Chomp level with the highest score.

Play tournament mode and complete the first three championships (Mushroom Cup, Flower Cup, Star Cup) to view the credits, and watch some animated outtakes from the opening FMV sequence. Complete the next three championships you unlock from this (Rainbow Cup, Moonlight Cup, Planet Cup) to view the credits again, but with entirely new outtakes.

Complete the indicated task to unlock the corresponding bonus.

Coin Challenge level: Complete the Gold Rush level.
Gold Rush level: Complete the Jackpot level.
Jackpot level: Complete the Fever level.

Win the Mushroom Cup tournaments in singles mode.

Hold Z + C + B then press A to get the "Event Games" option on the menu.

Win the Mushroom, Flower, and Star Cup in singles mode.