- Update 1.0.0.7 - 6 October 2026
Endless ModeUntil now, Endless Mode didn’t really give your craziest builds a chance to shine. We’ve reworked its difficulty curve — now the game will actually try to fight back and put even the wildest builds to the test! Important: Due to changes to the structure of Endless mode, Endless runs saved in previous versions are not compatible with this update, sorry for thatReworked the Endless Mode level structure — it now plays more like a boss rushDifficulty now increases significantly after each completed loopControls & UIImproved controller aimingIncreased the panning area in the inventoryPost-battle reward animations can now be skippedBalance & RewardsWinning on a certain difficulty now also unlocks achievements for all lower difficultiesImproved the Shaman’s trades: mushroom trades in the Swamp and Ancient Relic trades in the Cave now offer better rewardsThe Underground Baron now of…
- Hotfix update 1.0.0.6 - 2 October 2026
Update — October 2BalanceCapped the maximum Mushroom Jellyfish radius. Don’t worry, Jellyfish fans — it’s still huge.UI & InventoryFixed an issue where quick smelting an item from the inventory could automatically switch to another pageDestroying a combat railcar no longer causes the build to fall apart — active items now remain in their slots whenever possibleFixed inconsistent railcar prices between the starting selection and the Alcossum stationFixesFixed an issue that could cause weapons to randomly stop shootingFixed abrupt music transitions between scenesFixed liquid effects disappearing instantly when an enemy dies Thanks for all your feedback! Please keep it coming — it helps us understand what needs improvement and make Ammossum even better!
- 1.0.0.54 Hotfix is here - 1 October 2026
Update 1.0.0.54 are here! Black Screen Issue Resolved (again!)
- 1.0.0.52 Hotfix is here - 1 October 2026
Update 1.0.0.52 are here! Black Screen Issue Resolved
- Hotfix update 1.0.0.5 - 30 September 2026
Update — September 30BalanceShortened the overall run length and rebalanced several progression segmentsEarly-game power-ups now arrive faster, each hero have a combat railcar in starting shopBosses now deal more damage, making skipped boss fights more dangerousBear boss HP is reducedDifficulty III and IV now have distinct balance settingsDifficulty III now unlocks at Legacy Level 5 instead of 3Difficulty IV now unlocks at Legacy Level 7 instead of 5Added minimum enemy stat values for Endless Mode to prevent certain stats from dropping too low on lower difficultiesControls & UIImproved gamepad aiming. Aiming now behaves like a proper twin-stick setup instead of emulating a mouse cursorAdded the ability to change the screen resolutionFixed incorrect item filters when opening the Library from the pause menuFixesThe game will no longer attempt to load a corrupted session when using Continu…
- 1.0.0.4 Hotfix is here - 28 September 2026
Update 1.0.0.4 are here! Mouse sensitivity has been reworked, as some players were experiencing inconsistent mouse movementRailcar sounds now work as intendedThe main menu music no longer changes after a run ends
- Ammossum is OUT NOW! - 28 September 2026
Ammossum is OUT NOW!After four years of development, Ammossum is finally out on Steam! It still feels a little strange to write that. We've spent years building, rebuilding, testing and polishing this game, and today the full version is finally in your hands.Ammossum is an action roguelike about an opossum and his train making their way through a plague-ridden Wild West.Build endlessly upgradable weapons by combining different parts and evolving your projectiles, stack powerful synergies, support your build with combat railcars, and turn an ordinary weapon into something completely out of control!But most importantly — thank you!Thank you to everyone who played the demos and playtests, sent us feedback, reported bugs, made videos and streams, added Ammossum to their wishlist, or simply followed the game over the years.And a special thank you to our community translators, who helped us b…
- Ammossum Releases September 28! - 3 September 2026
Ammossum launches September 28!After years of development, the train is finally ready to leave the station. We've been working hard on the full version of the game, adding new weapons, items, railcars, characters, enemies, bosses, biomes, and much more.The full release will bring everything we've been building toward, and we can't wait for you to finally play it.See you aboard on September 28! 🚂
- 0.9.9.1 Update is here! - 17 May 2026
Update 0.9.9.1 are here! Added French localizationAdded Portuguese localizationAdded Spanish localizationFixed an issue where enemies would get stuck in the bridge arenaFixed an issue where the second boss would die immediately after the first bossFixed a bug where the "Will" aspect would cause a hardlockEndless mode — performance improvements for late-game stages
- On the Edge of Release: 0.9.9.0 Demo Update - 8 May 2026
You can join the demo through our Steam page. For all the latest news about the game, you’re welcome to join our Discord community! Ammossum v.0.9.9.0First of all, thanks to everyone who participated in our previous playtests, the Steam Next Fest demo, and shared their feedback.We've reworked and added a lot of things — so let's check out what's new!Changes:New Railcars and Updated Economy BasicsThe supply drop system has been replaced with a new railcar-based economy.We've added 10 different economic railcars, each providing unique items or bonuses after every battle. You can purchase new eco railcars or earn them as quest rewards.This means you can now scale your economy more effectively — and the start of the game is smoother than ever! We've also added a new battle railcar — the Shooter.This railcar, along with the existing battle railcars, now comes in 4 different types — one for e…
- Ammossum is Joining Steam Next Fest! - 25 February 2026
Hi everyone — Ammossum is participating in Steam Next Fest from Feb 23 to Mar 2 (PT)!We’d love for you to try the demo, and share it with friends who enjoy roguelikes and build experimentation!🕹️ About the GameAmmossum is a 3D action roguelike that blends deck building, third-person shooting, and train defense mechanics. Play as a fearless opossum in the Wild West. In each run, you'll upgrade weapons, choose aspects and quests, enhance your train, and survive increasingly intense enemy waves.Every choice shapes your route. Every run creates a new build.🌟Demo Available NowFor Steam Next Fest, the latest demo is fully available and includes:More Playable HeroesEach opossum hero comes with unique stats and progression paths, offering diverse build strategies.Choose Your Route at Each Station9 different station types appear randomly. Resources, risk, and pacing are now fully in your hands…
- 0.9.7.4 Update is here! - 23 February 2026
Update 0.9.7.4 are here! Added French localization
- 0.9.7.3 Update is here! - 20 February 2026
Update 0.9.7.3 are here! Fixed a bug where some items would freeze in the inventory after certain interactionsFixed a bug where weapons in the inventory could become invisible and unclickableFixed a bug where the inventory would crash after using a liquid twice on a weaponVarious small UI improvements.Crossbow alt-fire has been fixed
- 0.9.7.1 A bunch of fixes are here! - 18 February 2026
Hot Fixes 0.9.7.1 are here! Aiming has been reworked againFixed incorrect wording in several languagesController experience has been improved
- 0.9.7 A bunch of fixes are here! (And sorry — we had to wipe all user progress) - 15 February 2026
Bug fixes in 0.9.7 are here! 🔥 Fixed a bug where some players who participated in playtests couldn't run the demo.Various small UI improvements.Aiming has been slightly reworked.Fixed incorrect wording in several languages.We've also opened the demo page! So if you'd like to help us grow the Ammossum community, check it out — and welcome to our Discord!
- Time to change the route! 0.96 and open the demo - 11 February 2026
You can join the demo through our Steam page. For all the latest news about the game, you’re welcome to join our Discord community! Ammossum v.0.96First of all, thanks to everyone who participated in our previous playtests. We’ve added a big new feature and fixed old bugs — so let’s see what’s new!Changes:So yeah — the headline isn’t clickbait! You can now choose your route at each station. Stations come in different types, and routes vary in difficulty and length. There are 9 station types:Trading postTraining campArmoryHotelSmall campAmmo depotLarge ammo depotRusty ArmoryThe GuildBug fixes and others:Fixed a bug where the game crashed after certain inventory manipulations.Fixed issues with the controller selector — controller experience is now cleaner and smoother.Fixed an infinite loop bug (yes, for the second time 😅).Added more visual impact to the UI.General rebalance across the g…
- Controller support is back from the dead, plus hotfixes! 0.951 - 3 February 2026
Bug fixes in 0.951 are here! 🔥 Controller support has been fully reworked and now works as intendedFixed a crash caused by the brooms loopFixed a bug where the inventory was visible on the station screen on Steam DeckFixed a bug where some aspects (like Sword Guard) didn't workFixed a bug where enemies could spawn on the island in the battlefieldSee you soon in the next update!
- The HUGE update and the final wave of playtesting! - 30 January 2026
You can join the playtest through our Steam page. For all the latest news about the game, you’re welcome to join our Discord community! Ammossum v.0.95First of all, thanks to everyone who participated in our previous playtests and filled out the player surveys. It really helped us understand how to improve the game. We’ve updated it based on your feedback, so let’s see what’s new!Big things:New playable characters and locomotivesRailcars can now shoot!Hero stats systemNew Aspects system5 new battle arenasNew item mechanicsChallenges systemNew quests and new mini-game ...and much more! The update is already available in the playtest. See you!
- What's coming? - 4 January 2026
A huge thank you to all our playtesters!Last year, we ran four waves of playtesting with over 5,000 players across all versions. We implemented countless gameplay changes, tested new ideas and features, and — thanks to you — finally found our direction. Since the last playtest, we've made massive progress, and we're now excited to share some insights on the changes and announce our final playtest at the end of January!Start optionsWe introduce a new layer of strategic choice: you can now select one of 10 unique characters and pair them with one of 5 distinct locomotives. Additionally, you can choose an economy aspect that determines how you acquire new items after each battle. We're also introducing a Challenges system. After you complete a run on the classic difficulty, you'll unlock a new, harder challenge tier with stronger enemies who sometimes have new abilities!CharactersCharacter…
- Hot fixes 0.902 - 3 September 2025
Rebalance and bug fixes in 0.902 are here! 🔥 General balance update — All enemy stats have been reduced, and the number of enemies in each stage has been loweredFixed a bug with items rotationFixed a bug with cursor sensitivityFixed miswordings in the Chinese localization.Fixed a bug with bones gambleFixed a bug with Gamblers questFixed a bug with the cursor when the player had the reverse knockback upgradeFixed a bug where the wrong hotkeys were shown in the settings.
