Drop Duchy

Drop Duchy is a single-player video game that combines roguelike deck-building and Tetris-style PvE gameplay. The player chooses a faction, each with unique mechanics, cards, and abilities, before starting a "run" or playthrough. Each run is divided into three acts of increasing difficulty, each act consisting of a mix of battles, trading posts, resource collection points, and other deck-building locations. At the end of each act, the player will face a unique boss.

During a battle, the player must use their collected cards and the given terrain pieces in a Tetris style game. By finishing rows and strategically placing pieces, the player collects resources and can build a military, used to fight against the enemy in that round, which the player must also place pieces for. To develop more resources and defeat the enemy more easily, the player can upgrade their deck with new buildings and cards between rounds at various locations selected by the players route.

Drop Duchy was the first project of Paris, France-based developer Sleepy Mill Studio. Published by The Arcade Crew, it was first released on 5 May 2025, on Steam for Windows, and on 28 January 2026, on Xbox Game Pass for Xbox Series X/S. Further releases on PlayStation 5 and Nintendo Switch were released on 21 April 2026.

On September 15, publisher Doghowl Games announced a mobile version of Drop Duchy for Android and iOS platforms, scheduled for release on September 29.

Drop Duchy received "generally favourable" reviews, according to review aggregation website Metacritic. Fellow review aggregator OpenCritic assessed that the game received strong approval, being recommended by 89% of critics.

The Games Machine reviewed the game positively, describing the gameplay as fluid, praising the hybridization between real-time strategy and a puzzle game, and finding the game replayable.