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Wario Green: The Kamek Trickery and Yoshi Yellow: Iwark's Ruckus, known as Wario Fusion and Yoshi Fusion in Europe and Wario: Waku Waku Tomodachi Daisakusen! (Wario: Exciting Friendly Mission) and Yosshī: Waku Waku Tomodachi Daisakusen! (Yoshi: Exciting Friendly Mission) in Japan, are two paired video games for the Nintendo 3DS about a crossover between the Wario and Yoshi game universes.
The story begins with Kamek and Iwark joining forces to rid themselves of their respective enemies Wario and Yoshi by genetically modifying Kamek's minions and disguising them as Wario and Yoshi, leading the two protagonists to believe they are against each other. Wario and Yoshi are alerted of their respective worlds' predicament and are sent to get rid of the disguised monsters. Wario and Yoshi eventually encounter each other at Egg Island and Wario's Castle, believing each other to be a disguised monster. However, they soon discover that they have been tricked into fighting each other by Iwark and Kamek and decide to team up against them.
Not even Fletcher the Flutter nor the Ninjer Bros. can stop them, but Iwark uses his robotic creation, Robotoadie. The Stork informs Wario and Yoshi what Robotoadie has done. Wario rescues Baby Luigi while Yoshi distracts Robotoadie. Finally, Wario and Yoshi defeat Robotoadie at their own game. The Stork has an idea: If they put a tracer on Kamek and Iwark, they would track them to their headquarters. Yoshi defeats Iwark, but he forgot to insert the tracer. Wario defeats Kamek and he puts the tracer on him. Wario and Yoshi reach their headquarters in outer space. As a team, Wario and Yoshi defeat Baby Bowser and his older self and rescue the babies including Baby Luigi once and for all. They thank each other as the game ends with a photo of Wario having Yoshi in a friendly headlock, and the credits roll.
In these games, Wario and Yoshi have to travel in 5 different worlds and fighting the bosses.