Across heroes, players can upgrade and select complementary spells to build powerful synergies, enabling complex multi-hero ability combos even in solo play.

Shadowstone continues the Sunderfolk universe with a more dangerous and engaging strategic experience, as described by Secret Door’s leader.

Gameplay emphasizes deliberate positioning and unique hero abilities—like the Witch duplicating healing and exploding mushrooms, and the Berserker displacing enemies into lava—alongside endless randomized rooms and monsters per run.

The game will use mouse and keyboard, with potential mobile support in the future; Sunderfolk will gain keyboard-and-mouse support with a 2.0 update on March 10, adding a new Vanguard mission and enabling online PC play.

Shadowstone uses a hex grid, card-based abilities, and cooperative play, and it carries a darker tone and aesthetic relative to Sunderfolk.

Players will encounter endless combinations through a evolving pool of skill cards, equipment, and adaptive powerups tailored to different strategies each run.

Secret Door and Dreamhaven are developing Shadowstone, a roguelite spin-off set in the Sunderfolk world, designed to expand cooperative tactics with a run-based roguelite structure.

Players can dive in solo or online co-op with up to four players, featuring strategic turn-based play, hero-specific abilities, and card-based progression.

Early Access will run on player feedback via a Discord community, with playtests open to signups.

Shadowstone is planned for a 2026 release in Early Access at $14.99, on Steam and the Epic Games Store; it’s a standalone spin-off not requiring ownership of Sunderfolk.

Dreamhaven and Secret Door announced Shadowstone as a 1–4 player PC tactics roguelike launching in Early Access in 2026 for $14.99 on Steam and Epic Games Store.