Slay the Spire 2 beta patch adds new solo and co-op modes

Mega Crit plans to release the next big Slay the Spire 2 beta patch on November 12, 2026, and it is the first to include the experimental game modes the studio has kept secret for months. 

The developer set the date in its Neowsletter, where it described the release as "currently planned" for that day. At the time of writing, Mega Crit had not yet posted patch notes on Steam.

What Mega Crit has confirmed

Details are thin by design. The studio said the new content would have more impact the less it revealed beforehand. Co-founder Casey Yano did confirm one thing in the newsletter's Q&A: the new game modes will work in both single-player and multiplayer. He would not say how many modes are coming or how they play.

Experimental game modes have been on the early access roadmap since launch. In August, Mega Crit listed them as in active development alongside an alternate Act 2 and a new character. The studio has not said whether either of those arrives in this patch.

The wait has been longer than usual. Mega Crit had been shipping beta patches every two weeks, but the last one, v0.111.0, arrived on August 13. The team says it has spent the time since then, aside from a one-week studio break, on larger pieces of content that could not be built alongside regular balance updates.

Beta branch first, main branch catches up

The new content will be exclusive to the beta branch at first while Mega Crit works out the kinks. Players can opt in through Steam by opening the game's Properties menu, selecting Betas, and choosing the public-beta branch.

Players on the default branch get an update too. Mega Crit says the main branch will be brought up to date with everything in v0.111.0. That includes card reworks, balance changes, performance improvements, Indonesian localization, and low HP idle animations for all playable characters.

For the co-op players

Slay the Spire 2 launched in early access on Steam on March 5, 2026, and Mega Crit said it sold 3 million copies within its first week. Co-op has been a large part of that. Yano said many players only play multiplayer and that the studio wants to give the mode more longevity. Additional acts are also in the works.

Mega Crit expects beta players to be sharing balance feedback on the new content by the time its next newsletter arrives.