The Watcher downloadable contents expansion is available for Nintendo Switch, PS4 and PlayStation 5, Xbox One and Series X|S consoles, along with Windows through Steam, GOG, and the Epic Games Store.
The survival platformer's previously released Downpour expansion introduces five new playable slugcats with their own unique abilities and customized campaigns. The digital edition of the soundtrack is hosted on Bandcamp and Steam, with cover art by AnnoyingFlower.
From the product page:
Rain World: The Watcher is a DLC expansion of Rain World. Journey beyond to something, somewhere only ever glimpsed. When the world beneath your feet cracks and crumbles, will you hold on to all you once knew? Or dive into the unknown?Apple Music - Rain World: The Watcher (Original Game Soundtrack)
Laced Records Blog - Rain World audio design stories, Part 3: More Slugcats
— Rain World: The Watcher 🌙 (@RainWorldGame) March 25, 2025