Tic-Tac-Glow

Tic-Tac-Glow is a minigame that appears in Mario Power Tennis. Its name and gameplay are based on tic-tac-toe.

Gameplay
The minigame takes place in the Delfino Plaza Court, in which the player must shoot water balls to the opposite field filled with goop (3×3 goop spots) to free Shine Sprites. To score points, the players take turns trying to clear three squares of goop with the Shine Sprites underneath them. This is the only minigame in Mario Power Tennis that involves players taking turns. Water balls are shot out by pressing buttons to turn on the water nozzles only in the GameCube version. After a square is cleaned, the miniature Petey Piranhas soil the square again, allowing the player to accumulate points.

In the Wii version, the water balls are automatically shot out from the water nozzles instead of requiring the player to press the buttons on the floor.