Social networks are full of rumors about a possible collaboration between Nintendo and Fortnite. The rumours started after a cameo less Kirby in the trailer of the event Party Royale of the game.
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Fortnite has presented a great amount of linked events over the years, so that it would not be completely unheard of to see a crossover with the characters of Kirby, or the properties of Nintendo in general, but in this moment, everything is just a speculation friendly.
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Including, some have been speculating that this could be hinting at a character Fortnite that will appear in Super Smash Bros. Ultimate. It seems a little unlikely, but everything is on the table until Nintendo and Epic Games make an official comment.