Day 31

Day 31 is a wave-based horror survival game set in St. Harrow hospital. Thirty-one days after something buried beneath Harrow was released and the dead began walking, you are marked by a curse that counts down until you stop being yourself. You fight through the waves, manage the mark and explore the hospital and the flooded basement beneath it.

The infection clock

Every run begins with the countdown already ticking. Your nerve, the force of will that keeps you human, slows the curse: fighting generates nerve, and kills recover what the mark has taken. Hiding, freezing or giving up drains it. Kill streaks can push the infection back from the brink, while letting it advance can turn you into something else. You can die by bleeding out or by turning; these are different outcomes.

The Merchant and Mara

Between waves, Vessel, known to survivors as the Merchant, sells suppressants that slow the mark, ammunition that should not exist and weapons never made on Earth. He accepts nerve as payment, and spending it means you must earn more to use at his stall again. His ledger is bound in something that is not leather, and it holds a mystery. Mara, a doll who sits beside him, watches while you trade; she has never spoken to anyone who lived to report it.

Fight through St. Harrow

Combat pits you against relentless waves of enemies, including shambling dead, hazmat crews, basement mutations and a nurse. You can use pistols, rifles, shotguns and melee weapons, including a spiked bat taken from a corpse in the basement. You can carry two guns at a time, so buying a third means leaving one behind. The gunplay includes dismemberment and gore, and the horror builds dread rather than relying on jump scares.

You explore the hospital’s ground floor and the flooded basement beneath it. Restore the hospital’s power and open the elevator connecting the two areas, then push into the flooded darkness where the creatures from the quarantine ward went to finish changing. The current run ends after you drain the flooded junction; it has no conclusion beyond that point.

Game modes

The standard infection run combines wave combat with the countdown. Horde Mode removes the infection and countdown, leaving you to see how long you can hold against the dead. The game has four difficulty presets.

Current content

The core loop includes wave combat, four infection stages, the nerve economy and the Merchant between waves. The second floor of St. Harrow is not built yet, some later infection effects are visual rather than mechanical, and survivor voice lines and parts of the audio mix are unfinished.