20th Anniversary is a puzzle game developed by Sonic Team and published by Sega.

The game honored the twentieth year of the Puyo Puyo series, and was first released for the Nintendo DS in July 2011, and later for Wii, Nintendo 3DS, and PlayStation Portable in December.

[3] Except in Mission and Pair Puyo modes, a player is eliminated when they top out, and the last player (or side) standing wins the round.

The teammates share Nuisance Puyo and "lives" - when one of the teams' field tops out, the board is replaced with a new board with a pre-made chain and costs a life.

Like Puyo Puyo Fever 2 there is a shop, but instead of ineffective game play items the players can spend points they get from various modes for exchange of Puyo skins, alternate character voices, and alternate character costumes.