Puyo

Puyos, originally known as Puyo Puyo, are the eponymous creatures of the Puyo Puyo series. Puyos come in many shapes and sizes, but are always treated as mere fodder.

Description
Puyo's come in five different colours of red, yellow, green, blue and purple (not including the grey "Garbage Puyo"). When more than three puyos of the same colour are stacked together or lined in a match they will disperse and award points. They also appear in the RPG Madō Monogatari 1-2-3, a more story driven game in the Puyo Puyo series where they are classified as slime like monsters, each of elemental attributes based on their colours.

Dr. Robotnik's Mean Bean Machine
The game Dr. Robotnik's Mean Bean Machine is actually a localized version of the 1991 arcade puzzle game Puyo Puyo. Instead of translation, the whole story and franchise of the game was replaced with Adventures of Sonic the Hedgehog, wit hthe puyo's renamed as "bean folk".

Sega Superstars
Puyo's appear in the EyeToy game Puyo Pop Fever where the playaer must positioned themselves to guide them into the corresponding pots and allow bombs to topple off the bottom of the screen.

Sega Superstars Tennis
Puyo's appear in Sega Superstars Tennis. Found on the Splash Garden course (Coconut Beach course in the Nintendo DS version) for the minigame Puyo Pop Fever. Puyos are stacked while the player serves the ball to pop them. Each puyo is worth 40 points. The game is over when either the timers or the bubble gauge are filled

Sonic Runners
The mobile game Sonic Runners had the "Puyopuyo!! Quest Collaboration Event" to promote the game Puyopuyo!! Quest.

Team Sonic find Puyos raining down on earth and run into Amitie and Accord who have no clue to how they got there. With the world being filled with Puyo Puyos, Sonic accepts Accord's request to find their other friends to stop the crisis. Along the way, it is revealed that Dr. Eggman has used the magic of a Puyo Coin to join the two worlds together so he could harness the power of magic users for a new weapon. As Team Sonic proceeds with their search, Eggman gets in over his head with the magic users and is forced to escape when his prisoner Satan retaliates. Thanking Team Sonic for their help, the Puyo Puyo return home with all the objects from their world.

Sonic Mania
In Sonic Mania, Doctor Eggman forces Sonic the Hedgehog into a Puyo Pop match which plays like a regular match from the original Puyo Puyo game.

Trivia

 * In the games Puyo Puyo! 15th Anniversary and Puyo Puyo Tetris, Puyo in shape of Sonic characters can be unlocked.
 * In Sonic Mania, the boss fight of Chemical Plant is likely to reference Dr. Robotnik's Mean Bean Machine despite the continuity of the game taking place in [Adventures of Sonic the Hedgehog]].