GRAIN ROT · Launch build · checked 2026-08-12
Survival and progression answers you can trust.
Find the current answer for the run you are in, with source labels and clear limits where the game is still changing.
Where are you stuck?
Choose the problem, not a keyword.
ProgressionI do not know what unlocks nextOpen guide →Vessels & SparkMy vessel broke or my Glow is fadingOpen guide →Gear & SurvivalMy gear is damaged or I keep losing runsOpen guide →Enemies & ExplorationI need safer ways to exploreOpen guide →MultiplayerI need help joining or planning a groupOpen guide →
The core loop
Descend → Scavenge → Extract → Rebuild the Outpost → Go deeper
Browse by system
A small, usable field manual.
Start HereGRAIN ROT is a co-op extraction builder: descend, scavenge, extract, rebuild, then go deeper; solo is supported but generally harder.Progression & OutpostProgress comes from extracting resources and rebuilding the Outpost; deeper access depends on current-version content and completed unlocks.Vessels & SparkYour Vessel is a temporary body; when it breaks, the Spark continues and must manage Glow while seeking another host.Gear & SurvivalPreserve useful gear, repair eligible items after the second-floor machine is available, and treat unsupported combat tricks as unverified.MultiplayerGRAIN ROT uses player-hosted Steam lobbies, supports solo, has no public matchmaking, and is balanced around roughly four players without a fixed hard cap.Updates & PlatformsWindows via Steam is the supported launch platform; compatibility and guide facts must be rechecked when official updates change them.
Reliable answers
Start with the questions players ask first.
Verified with caveatsThird FloorAs of August 12, 2026, the third floor is not available as a normal progression unlock. Players can stack furniture from the second-floor balcony to reach an empty area, but that is an exploratory route, not an official unlock.Verified with caveatsRepair Weapons & ItemsAfter unlocking the second floor, use the repair and enchanting machine for 100 gold to restore an eligible item to full durability and add an enhancement. Healing Glue is not a general weapon repair method.Verified answerRecover Spark GlowMove your Spark near a light source or a friendly player to recover Glow. Do not publish exact recovery rates or distances because current evidence does not establish those values.Verified answerBroken Vessel & ReviveGRAIN ROT does not use a normal downed-player revive loop. When a Vessel breaks, the Spark remains in the run and looks for another host; the run’s carried loot is lost only if the whole group loses its Vessels before extracting.Verified answerInvite FriendsThe host creates a Steam lobby, then friends join through a Steam invite or the Steam friends list. There is no public matchmaking, and every player needs their own copy of the game.Verified answerPlayer CountGRAIN ROT is balanced around roughly four players but has no fixed player cap. The practical group size depends on the host and hardware; one reported six-player session is evidence of possibility, not a universal guarantee.
Current version
Updates change answers, not our standard.
When official changes affect a guide, we recheck the original answer instead of publishing a duplicate news page.
View updates and platforms →Evidence promise
Clear labels, current version, visible limits.
Official sources are preferred. Community-tested details are labeled, and uncertain mechanics stay out of the launch navigation.