EXTRA STAGES - Smash Bros. for Wii U Hacks - YouTube
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Sm4sh Stage Expansion Pak [Super Smash Bros. (Wii U)] [Mods]
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SmashBros-Ultimate on Twitter: "Let's try again! :D. 14 stages left from other series are not included so far in #SmashBrosUltimate. 2 from N64, 4 from Melee, 1 from Brawl, 2 from N3DS
Super Smash Bros. Wii U Update: New Stages for 8 Player Smash! - YouTube