ぷよぷよ！15th Anniversary/ Puyo Puyo! 15th Anniversary

Puyo Puyo! 15th Anniversary was created by Sonic Team to commemorate the 15th anniversary of Puyo Puyo. As such, it revives both the gameplay rules of the arcade Puyo Puyo and Puyo Puyo Tsu, as well as six characters from the Madou Monogatari era of the series. It was released for Nintendo DS in 2006, and in 2007 for PlayStation 2, PlayStation Portable, and Wii This game was followed by Puyo Puyo 7.

Ms. Accord, the teacher at the Primp Magic School, informs Sig that there will be a tournament up for play, and everyone's competing; the reward is a medal that will grant anyone's single wish. Another scene shows Amitie and Arle pledging to play by the rules, and Sig, still as clueless as ever, eventually plegdes as well, but not before witnessing six comets fall down onto Earth. Sig, realising that this is a big discovery, decides to ignore it anyhow and goes onto the competition. It turns out that the "comets" are actually six familiar characters from the Madou series, who serve as boss characters in the story modes.