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UnderMire is a hand-drawn first-person roguelite adventure that drops one to four players into a magical bunker twisted by dark forces beneath an old English manor. After becoming trapped during a school trip, four teenagers must descend through ever-shifting biomes—from familiar office spaces to underground gardens and beyond—guided only by the cantankerous spirit of a thousand-year-old cat. Each run presents a procedurally-generated layout filled with fear-fueled monsters, environmental hazards, and mysteries to uncover.

The core gameplay loop revolves around tactical exploration and improvised combat. Players navigate the bunker's layers, managing a fear gauge that triggers hallucinations and spawns dangerous creatures if left unchecked. Combat emphasizes creative problem-solving: break and repair bunker systems like power and lighting, deploy elemental magic to electrify water or burn obstacles, and craft weapons on the fly using the game's signature SMUSH system.

The SMUSH mechanic is central to UnderMire's identity. Players combine everyday junk, bizarre food items, and found objects into healing potions, improvised explosives, and unusual elemental weapons. This crafting system encourages experimentation and rewards scavenging, turning mundane items into tactical assets. Each of the four playable characters—Hannah, Leo, Rawiah, and Sam—brings distinct tools and playstyles, from spell-casting tomes to traditional melee weapons.

Co-op chaos is amplified through proximity voice chat, which keeps communication immersive and adds genuine tension when coordinating survival. The game supports solo play or drop-in/drop-out online multiplayer with up to three friends. Procedural generation ensures no two descents feel identical, while a persistent mystery unfolds through character interactions and environmental storytelling.

UnderMire appeals to players seeking cooperative roguelite experiences with genuine mechanical depth. The blend of horror atmosphere, comedic moments, hand-drawn visuals, and accessible-yet-challenging gameplay makes it suitable for both casual groups and players who enjoy roguelike progression systems. The emphasis on creative problem-solving over reflexes ensures varied playstyles and strategies.