Unlike the other methods, the path to unlocking fighters in Adventure Mode can be the most rigorous and time-consuming.
World of Light Character Locations & Guide - Smash Ultimate
World of Light (Adventure Mode) Guide and Map
Adventure Mode: World of Light - SmashWiki, the Super Smash Bros. wiki
How to Unlock All Characters in SSBU
Characters and Roster - Super Smash Bros. Ultimate Guide - IGN, smash
Cliffside Rapids - Super Smash Bros. Ultimate Guide - IGN
World of Light Character Unlocks And Map - Super Smash Bros. Ultimate Guide - IGN
Dark Realm - East - Super Smash Bros. Ultimate Guide - IGN
Badlands - Super Smash Bros. Ultimate Guide - IGN
Super Smash Bros. Ultimate: 10 Tips To Beat World Of Light