Like other Smash Bros. games, you'll be able to unlock different things like Music, Mii Outfits - and of course - Fighters. This page will guide you on
Super Smash Bros. Ultimate guide: How to quickly unlock every character - Polygon
Most Searched Cheats, Tips, and Guides for Super Smash Bros. Ultimate - IGN
Smash Bros Ultimate: Guide To Unlocking Characters
Adventure Mode - World of Light Walkthrough - Super Smash Bros. Ultimate Guide - IGN
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All 74 Super Smash Bros. Ultimate Characters Have Been Revealed, DLC and Fighters Pass Announced - IGN