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I'd appreciate spin-offs better if more of them actually had some connection to the main games, like transferring/copying your bros for use in the new game or to unlock some feature, as well as bring back something from the spin-off to the main game. Doesnt even have to be a Stadium type game, like maybe we can use our bros in Rumble World and bring back a Rare Candy or a Pokemon with a move and ability it can't have.