court, which hinder movement when the character comes into physical contact with them. Although standard tennis is available, variants of the sport can be played which adopt different rules and methods of victory. "Ring Shot" involves the player earning points by hitting the ball through rings of varying sizes, with the number of points dependent on the difficulty of the shot. The player acquires the points whenever a winning shot is made adhering to standard rules; the match is won once the predetermined number of points is equaled or surpassed. A similar mode, "Item Battle", involves the characters using items based on the Mario universe to interfere with each other's game and gain an advantage. The central mode of the game is "Tournament Mode", which comprises a set of events with accumulating difficulty. This set of events must be finished successfully to unlock playable characters. This mode can be completed either in "doubles" or "singles", and is divided into Gimmick courts and standard courts. An alternative to these are "Special Games", which involve the player trying to meet a tennis-related objective on a Gimmick court. These Special Games come in multiple forms, incorporating themes from past Nintendo games, such as "Tic-Tac-Glow", which requires the player to hit balls of water to liberate Shine Sprites trapped in dirt, a reference to Super Mario Sunshine. Power Tennis supports the option for four-player multiplayer, which can be accessed during "Exhibition Mode", the standard mode of play where the player can choose his or her opponents and the conditions of the match. Such options include the difficulty of the opponent, the court used, and the number of games and sets required to win the match. Power Tennis features 18 playable characters, all of whom derive from the Mario franchise. Many characters, such as Wario, had already appeared in the game's predecessor and several other Mario spin-offs, while this was the first appearance for Wiggler as a playable character. All of the characters are categorised into six groups that reflect their playing style: all-around, technical, power, speed, defensive, and tricky. Inherent in each character is a set of two unique moves known as "Power Shots". These powerful moves, which are accompanied with an animation each time they are triggered, incorporate the character's specific qualities. They can only be triggered occasionally in the match, but will usually result in defending or scoring a point, depending on