Hollow Knight: Silksong Sea of Sorrow Expansion Is Free in 2026

Team Cherry confirmed Sea of Sorrow, the first major Hollow Knight: Silksong expansion, as a free update for all players in 2026. It adds new areas, bosses, tools and more on a nautical theme. No exact release date was announced. The same update reported more than seven million Silksong purchases, with millions more players through Xbox Game Pass.

Team Cherry describes the expansion as already well underway and continues Hornet's journey rather than starting a separate game. The studio is holding back the map, boss list, tool set and story setup until closer to release, so the announcement establishes direction and price rather than scope.

Because only a 2026 window exists, any store listing, countdown or social post claiming a specific day goes beyond what Team Cherry has said. The studio indicated more information will follow shortly before release.

Team Cherry has not announced a paid upgrade path or a separate eligibility requirement, so keeping the base game updated is the only preparation. The studio's continued work on the original Hollow Knight is a separate project from this expansion.

Team Cherry announced Sea of Sorrow, its free pricing, the 2026 window and the seven-million milestone in a studio blog update on December 15, 2025, published alongside the teaser video.