Mycopunk Ouroboros Guide: How the Roguelike Mission, Cleansing, and Contraband Work

Ouroboros is the Mycopunk update that throws your carefully farmed upgrade collection out the window on purpose. If you have been trying to work out how the Mycopunk Ouroboros mission fits into normal progression, the short version is this: it is a roguelike run layered on top of a co-op FPS, and every room is another chance to build something ridiculous. Learning the reset rules, the cleansing economy, and what Contraband actually means is the difference between a run that snowballs into nonsense and one that stalls out in the first ten rooms.

What the Mycopunk Ouroboros Mission Actually Changes

The official Steam announcement for the Ouroboros update (published December 17, 2025) describes it as a roguelike mode built around Mycopunk's upgrade system, which the developers felt was already a natural fit for run-based play. Launching Ouroboros temporarily clears every upgrade you have equipped. You then find and equip new ones as you push through rooms.

The word "temporarily" matters. Your permanent collection is not deleted — it is set aside for the duration of the run. What changes is that you have to rebuild from scratch each time, using whatever the mission decides to drop.

Two design decisions do most of the heavy lifting:

• Almost every upgrade is stackable. Duplicate picks are not dead picks. Stacking is the whole point, and the developers explicitly say that a run being overpowered is fine.
• Ouroboros can drop upgrades you have not unlocked permanently yet. The mode doubles as a discovery tool, letting you test pieces of the wider pool before you own them.

Devolver Digital's Ouroboros update video post (December 18, 2025) frames it the same way: new roguelike mode, new upgrades, built for groups.

Contraband, Oddity, and How Cleansing Works

Ouroboros introduces a rarity that exists nowhere else in Mycopunk: Contraband. Keeping these exclusive to the roguelike mission gave the developers room to design effects they would not want loose in the standard upgrade pool. The announcement does not spell out individual Contraband effects, so treat build write-ups from other players as reports rather than documentation.

Oddity upgrades behave differently here too. Due to player demand, they show up far more often inside Ouroboros than in normal play — but they are expensive to cleanse.

Cleansing is the bridge between a run and your permanent account. At the end of a run you get the chance to cleanse some of the upgrades you used, keeping them forever. The official post says "some" and stops there, which means you should expect to make hard choices rather than haul your whole build home.

Player experience fills in a little of the gap. In a Steam Community feedback thread with posts dated February 21–24, one player reported being blocked from cleansing Star Fuel, Course Correction, and Quickfire despite those being epic-tier rather than Contraband, while also noting that Contraband extraction seemed to be off the table by design. Treat that as an unresolved community observation — the developers have not published a definitive cleanse list.

New Upgrades Worth Hunting in Mycopunk Ouroboros

The update shipped thirteen new upgrades across the existing employee classes plus one redacted Oddity. Here is the full list as described in the patch notes.

A few of these pair obviously. Grenade Belt plus In For A Penny turns incoming damage into outgoing grenades, which suits the chaos of a stacked run. Explosive Personality and Vending Machine both feed off the health-chunk economy, and because enemy cores guarantee at least one chunk, the Scrapper has a dependable trigger in crowded rooms. Cannonball and One-Two Punch reward Bruisers who chain dives into projector shots instead of diving reactively.

The Supporting Systems Behind Ouroboros Runs

Several changes in the same patch quietly shape how the mode plays.

The Codex is a new inventory tab listing every weapon, upgrade, and skin in the game. Selecting an entry tells you how it is acquired, unless the method is deliberately secret, and it also collects the data logs you find so you can reread Roachard's private emails. Because Ouroboros can drop upgrades you have not permanently unlocked, the Codex is the fastest way to see what a run just revealed.

Pocket Reload reworks ammo flow: damaging an enemy with your primary weapon now loads ammo into your other weapon's magazine before filling reserves. Third Arm was reworked to match and takes less space.

Death Protection means most lethal damage now almost kills you instead of killing you, once, until you return to full health.

Upgrade rotation is now unlocked one rarity at a time, which matters if you are returning to Mycopunk after a break:

Combat tuning landed alongside these. Enemy autocannon damage dropped 40%, with reduced spread and bullet speed; enemy lasers now show a thin warning line before they can hurt you; Abominations can melee everyone in range instead of one target. Players also no longer damage each other during missions, which matters in a mode where stacked builds get out of hand. Heavy weapons left on the ground now despawn after two minutes, so pick up what you drop.

Player Experience: What the Community Says About Ouroboros RNG

The loudest feedback in the Steam Community Ouroboros discussion thread is not that the mode is bad — it is that drops feel too random. One player who said they enjoy Ouroboros more than the base game still described a run dying because the first set of rooms offered mismatched picks, ending on a character-only Contraband drop. They argued upgrade offerings should not repeat back-to-back, or at least should lean away from the same weapon.

Another player reported that the first twenty rooms gave them nothing but player and grenade mods, with the only weapon drop being a Plate Launcher. A follow-up in the same thread defended the Plate Launcher as genuinely strong once you stack an arc mod and decay and expand the magazine, since the plates keep regenerating ammo for an ammo-hungry secondary.

Practical takeaways from that feedback, without pretending it is official guidance:

• Commit to stacking early. Since nearly everything stacks, a run that spreads picks thin fights the mode's design.
• Judge a run by its first few rooms. Community reports describe dead-start runs often enough that restarting early is cheaper than grinding a mismatched build.
• Use the Codex after bad runs. It tells you what Ouroboros exposed and what you still have not unlocked permanently.
• Expect cleansing limits. Plan which upgrades are worth carrying out before the run ends, not after.

FAQ

Do I lose my permanent upgrades when I start Mycopunk Ouroboros? No. The official announcement says launching Ouroboros temporarily clears your upgrades, and you find new ones as you progress through rooms. The reset applies to the run.

Can you keep Contraband upgrades after a run? The announcement does not say Contraband can be cleansed, and player reports in the Steam discussion thread suggest Contraband is treated as non-extractable. Plan on enjoying Contraband for one run only until the developers state otherwise.

How do I unlock upgrade rotation for higher rarities? Rotation now unlocks by rarity: Standard at level 3, Rare at level 8, Epic at level 16, and Exotic and above at level 30.

Is the Mycopunk Ouroboros update discounted? As of the December 17, 2025 Steam announcement, Mycopunk was discounted 20% in celebration of the update, with the developer stating the deal ran through the Steam Winter sale. That was a dated promotion, so check the Mycopunk Steam store page for the price in effect when you buy.