Full-release news and old Demo fixes are kept in separate lanes. A Demo version number is never presented as the current retail build.
Current status
Is your game older than 9.0.97?
Update first. Patch 9.0.97 raises the Essence Machine upgrade cost to 2 Essence and fixes Adventurer, Soot Rift, controller and backup-handling issues. Earlier 9.0.91 and 9.0.901 fixed Stackpedia and save-loading errors. Versions 7.0.30 and 7.0.33 are old Demo builds.
Before troubleshooting: Check the linked Steam News page in case a newer patch is available. As of 2026-09-26, 9.0.97 is the newest official patch found.
Launch-week activity
Eight numbered patches in the first five days
Stackmon received three numbered patches on August 19, one on August 20, two on August 21 and two on August 22, plus a separate developer Launch Update. That is a useful sign of active fixes, but only the linked note below can tell you whether your exact problem changed.
8first-five-day patches
1Launch Update
18numbered patches tracked
9.0.97latest checked version
If your build is older than 9.0.97, let Steam finish updating before you troubleshoot. Then match your symptom to the specific patch below.
Full release
9.0.97
This update changes Essence Machine upgrade cost and fishing affinity, and fixes Adventurer, Soot Rift, save, controller and card-interaction issues.
Fishing now has Water Stackmon affinity
Essence Machine upgrades require 2 Essence instead of 1
Equal recipes from upgraded buildings show once on recipe lists
Fixed Adventurer tasks not starting after loading and accepting unconscious Stackmon
Fixed card inspection, collision, stacking and status-effect interactions
Fixed Soot Rift card duplication and money not returning after leaving
Fixed the Store Sell button
Fixed a controller new-game Load button that could overwrite a save slot
Fixed Day/Night abilities when Equipment was equipped
Fixed Last Hope removal and unconscious Sootlings on loading
Game backups are now stored outside the Steam Cloud folder
Changes by system
Stackmon retail build: Newest numbered public patch found
Before
9.0.91
Current patch note
9.0.97
The September 17 official update supersedes 9.0.91 as the newest numbered patch found at this check.
This update adds a Soil recipe and Idea Card, adjusts Soot Rifts and Auto-Stack, and fixes several recipe, evolution, capture, equipment and UI problems.
Added a Soil recipe and Idea Card
Adjusted Soot Rift rewards and reduced some spawn waits
Increased the Auto-Stack radius and added a Backpack gamepad hint
Fixed Store and Recipe UI when skipping the tutorial
Fixed evolution-screen issues and negative attributes on captured Stackmon
Fixed wild Stackmon defeat visuals after capture
Fixed Recipe hints, Soot Amulet and Incubator text
Fixed Trainers not receiving Equipment effects correctly
Changes by system
Stackmon retail build: Newest numbered public patch found
Before
9.0.882
Current patch note
9.0.90
The official Steam update adds a Soil recipe and adjusts or fixes Soot Rifts, recipes, evolution, capture, Equipment and UI behavior.
This patch improves Storage card dropping and fixes status hints, healing, Money Chains, equipment hovers, House saves, breeding, Soot items, Greenhouse tasks and several collection rewards.
Added hold input to drop more cards from Storage
Fixed Weak status hint text and Effective Healing calculations
Toboro now has more uses and shows them on its card
Money Chains now triggers only when an enemy Stackmon is hit
Fixed equipment hover parameters and a locked House save state
Buffed captured Stackas and fixed breeding with the wrong Stackmon
Fixed Soot Amulet stacking and Soot Herb consumption
Made Effective Gatherer work on Greenhouse tasks
Increased XP Potions and adjusted the Catch 30 Stackmons Reward Pack
Fixed medals stacking after completing a Soot Rift
Changes by system
Stackmon retail build: Newest numbered public patch found
Before
9.0.85
Current patch note
9.0.87
The official Steam announcement superseded 9.0.85 with fixes and balance changes across Storage, status effects, Houses, breeding, Soot items, Greenhouse tasks and collection rewards.
Builder and Assistant missions, Odem return and Blacksmith Packs: Mission and reward flow
Before
Some upgraded Buildings failed Builder missions, Assistant verification could fail on load, player cards could stay away after Odem, and Blacksmith Packs could become infinite
Current patch note
All four problems are listed as fixed
The official patch confirms the fixes without publishing the full mission list or pack contents.
This patch fixes achievement completion, wild attributes, several route abilities and events, Adventurer losses, upgraded-building checks and a Rock Egg incubator issue.
Fixed achievements not completing correctly
Fixed issues after winning arenas and several freeze issues
Stopped leader events appearing on the wrong routes
Fixed wild Stackmon not receiving their intended attributes
Made Stomp show its duration and fixed Swim on some ponds
Made treasure chests stack
Fixed Adventurer causing Stackmon and medals to disappear and made it accept the Soot Medal
Made Rock Egg work on Incubator +2
Made Builder accept some upgraded buildings
Changes by system
Stackmon retail build: Newest numbered public patch found
Before
9.0.82
Current patch note
9.0.84
The official Steam announcement superseded 9.0.82 with fixes for achievements, wild attributes, route abilities, Adventurer, upgraded buildings and Rock Egg incubation.
Achievements, wild attributes and route abilities: Progress and route behavior
Before
Achievements could fail to complete, wild Stackmon could receive unintended attributes, and several route abilities or events could misbehave
Current patch note
Achievement completion and intended wild attributes are listed as fixed; Stomp now shows duration, Swim works on affected ponds, and misplaced leader events are fixed
The official note names each fix but does not publish current creature stats, ability values or arena rules.
Adventurer could remove Stackmon or medals, upgraded Buildings could fail checks, Rock Egg could fail on Incubator +2, and treasure chests did not stack correctly
Current patch note
Adventurer loss and Soot Medal acceptance are fixed, Builder accepts some upgraded Buildings, Rock Egg works on Incubator +2, and treasure chests stack
The patch confirms the interactions without publishing every Builder objective or Egg inheritance rule.
A larger launch hotfix changes how finite-use buildings behave, strengthens save handling and addresses equipment, medal, input and card-state problems.
Campfire, Garden, Lumber House, Mine and AP Machine now become Depleted instead of disappearing
Depleted buildings can be restored with specific in-game recipes
The new save system accepts legacy files and blocks corrupted files from being saved or loaded
Fixed Fire Medal recovery and several equipment release/reset problems
This launch-window patch targets save loading, Stackpedia recovery, Evolve Gem behavior, healing, resource drops, Structures, controllers and several card-state problems.
Adjusted the save-backup system and fixed a crash on load
Adjusted Stackpedia progress recovery
Stopped Evolve Gems stacking with wild Stackmon
Fixed healing effects on unconscious Stackmon
Raised the chance of Eppla Fruits from Trees
Raised the uses of all Structures
Fixed the controller button for untaming Stackmon
Changed the fast-forward key to CTRL
Fixed missing Badges, Storage price display and Trader offers
Changes by system
Stackmon retail build: Newest numbered public patch found
Before
9.0.72
Current patch note
9.0.74
The official Steam announcement superseded 9.0.72 as the newest numbered full-release patch found during this check.
A developer response published after 9.0.72 confirms these two examples; it does not say the patch introduced them or that they form the complete Furnace recipe set.
Riftpoint said the Steam Demo had been removed so the team could focus on the full game. Demo progress does not transfer because the retail save structure changed.
Steam Demo no longer available
No further Steam Demo updates planned
Demo progress does not carry into the full game
Development web versions may still be available on Itch.io or GX Games
Changes by system
Stackmon Demo on Steam: Availability
Before
Listed on Steam at the August 18 launch check
Current patch note
Removed from Steam; no further Steam Demo updates planned
The developer said the Steam Demo was removed to focus on the full game and that its incompatible save structure prevents progress transfer.
The first numbered full-release patch addressed launch issues around packs, Soot corruption, missions, task speed, Trainer loading, Bike uses and duplicate knocked-out UI.
Fixed pack null references and mouse click timing
Added mission focus handling to the animation queue
Fixed two Soot corruption state leaks
Fixed task speed modifiers and unconscious Trainer loading
Fixed Bike-use display and repeated Knocked Out UI
Updated localization and removed the launch Wishlist menu item
Changes by system
Stackmon retail build: Newest numbered public patch found
Before
Launch announcement without a numbered retail patch
Current patch note
9.0.69
The official Steam announcement published the first numbered full-release patch found during the launch window.