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Empires of the UndergrowthNewsOptional Beta Invite - New Creatures, New Map, Setup Saving & Editing!
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Optional Beta Invite - New Creatures, New Map, Setup Saving & Editing!

Empires of the Undergrowth · published 11 Oct 2026, 20:21 UTC

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It's time for an optional beta! This time, we're giving a little bit of TLC to the swamp environment with two new swamp creatures - the rough green snake Opheodrys aestivus, and the adult form of the eastern newt Notophthalmus viridescens. Both of these are huge creatures, and they come with a new swamp-themed custom game map called Creek.

A rough green snake encounters some very confused ants (by AhYesAnts)

Alongside the updates to the swamp environment, this beta introduces freeplay setup saving - a way to make a template of your preferred custom game settings so that you don't have to re-enter them every time you want to start a new game. On top of this, the spreadsheet-based template files can be edited externally for lots of interesting effects - a separate guide explaining how this works is included as a work in progress. If you'd like anything detailed in this guide that currently isn't, please let us know and we'll add extra detail in that area.

The beta needs a password - it is theswampedbeta. If you don't know how to join a Steam beta, here are the instructions:

  1. Find Empires of the Undergrowth in your Steam library, right-click on it and choose "Properties"

  2. Choose the "Game Versions & Betas" tab

  3. In the box titled "Private versions", enter theswampedbeta

  4. After the "Access code correct" information appears, make sure you've chosen "optionalbeta" from the "Select the beta you would like to opt into" drop-down menu

  5. Press close - the game will now update to the beta branch.

A sand lizard has an argument with a full-grown eastern newt (by Solstitium)

IMPORTANT: Back up your saves

The format in which games are saved has been changed with this update. We're quite confident from our testing that this won't cause problems, but if you participate in this beta your save files will be irrevocably changed to the new format and won't work with the older version. Therefore, it is strongly recommended that you manually back up your save files if you ever intend to return to the non-beta version.

To do this, follow these steps:

  1. Open an explorer window and paste this into the address bar:

    Windows: %LOCALAPPDATA%\\EotU\\Saved\\SaveGames
    Mac: ~/Library/Application Support/Epic/EotU/Saved/SaveGames
    Linux: ~/.config/Epic/EotU/Saved/LevelSetups/

  2. Copy the entire contents of the SaveGames folder and paste it somewhere safe (like your Desktop). This is your backup for if you decide to go back to non-beta version

  3. To restore your backup close the game, delete the contents of that SaveGames folder, and simply copy your backed up files back in.

Snake vs newt (by AhYesAnts)

Patch Notes

Headline Features

  • Added 2 new huge-class swamp creatures

    • Rough green snake Opheodrys aestivus

    • Eastern newt adult Notophthalmus viridescens

  • Added a new swamp-themed custom game map: Creek

    • Set in the fork of a slow-moving swampy creek

    • Designed for 2v2v2 combat

    • In skirmishes, one of the two new creatures will patrol the outskirts of Creek in a circular patrol pattern

  • Freeplay setups can now be saved and loaded

    • Build a freeplay setup in any configuration you like, save it, then export it to a CSV spreadsheet file to share with other players

    • Edit your custom game setup spreadsheets for detailed control

    • Save setup files can be edited externally to arrange a game exactly how you want

    • Options that aren't available in the menu, such as each colony's underground starting chamber and its surface tunnel (alternative exits and termite mounds included) can be accessed this way.

    • The game will load and play your setup precisely as you designed it

    • The functionality of freeplay setup CSVs will be expanded on over time

    • A Steam guide for the full functionality of CSV editing is currently a work in progress

  • 5 example freeplay scenarios to demonstrate the CSV editing capabilities

    • Hunt the Ubers: you have a super-powerful ereptor colony and ubers will begin spawning extremely quickly and relentlessly

    • Bad Neighbours: leafcutters vs fire ants, starting super close to each other

    • Pot Luck: 4 colony free-for-all with randomised species, with more rapidly changing landmarks

    • Waves from Hell: you're a powerful Matabele colony under relentless attack from buffed waves, fed by enemy termites

    • You vs the World: super-powerful fire ants vs 5 allied enemy colonies

Changes

  • New creature models, textures and animations for the devil’s coach horse and slave-maker ants

  • Significantly reworked memory usage and allocation for efficiency which should result in some performance increase and loading time decrease

  • Nest numbers have been replaced with glyphs

  • Save files are now significantly smaller and faster loading

  • Lots of polish and refinement to the way the new UI works with controllers

  • Added a hotkey for the Inspect tool which can be rebound in the menu for keyboard & mouse users

  • Inspect tool button has been moved next to the pheromone panel

  • Arachnophobia mode now turns the creature icons in the Battle Arena spawner into hats

  • The queen is given more space when playing as termites in Chowder

  • The objective in 4.2 saying "Workers are worth less" has been reworded to "Soldiers are worth more" to avoid localisation issues

  • Alligatorback scorpion harvest slots increased to 8

  • Moving between formicarium stage 4 and 5 now keeps slightly more brood & food chamber tiles

  • Notifications now appear in front of subtitles to aid low resolution screens like the Steam Deck

  • Victory & defeat images added for Myrmecia ereptor colonies

  • Ranged wood ant variants now have different icons

  • Texture resolution improvements on 4.2 A Bridge Too Far

  • Termite species are now playable in Chowder in Remix mode

  • Rising Tide, Queen of the Hill, Sand Spit & Towhead water look updated

  • The skip button has been restyled and is hidden when playing with a controller in the 4th formicarium challenge

  • Localisation updates

Fixes

  • Fixed controllers not being able to select a unit option when launching a level

  • Fixed several save game crashes relating to climbable plants, large creatures and nest entrances

  • Fixed the adaptation tooltip video breaking when moving quickly between tooltips

  • Fixed the termite minor soldier showing the major soldier's build icon

  • Fixed exploding termite workers counting as soldiers on the population tooltip

  • Fixed major termite soldier/worker nursery counts being incorrect

  • Fixed shore crabs and sand lizards not spawning in custom games in some circumstances

  • Newer uber creatures now count toward the Hunter victory condition in custom games

  • Fixed the centipede’s stun applying several times in one hit

  • Fixed the enemy colony trying to dig through rock in The Harvest

  • Fixed the leafcutter super major tooltip showing no name

  • Fixed a victory notification flicker as the UI faded out

  • Fixed broken victory/defeat sequences in Strawclutch

  • Removed a harvest point from a leaf that was unreachable in Adventure

  • Fixed some situations when hovering over a tile displayed an incorrect cursor icon

  • Fixed defeat animation issues in Drive Them Back (custom game version)

  • Fixed cavern resource/danger sliders failing to load from a setup file when set to minimum

  • Fixed scientist 2 announcing the unlocking of the fire ants if it happens after FC4

  • Fixed Formica ereptor royal guard attacking slowly

  • Bombs in bomb mode can no longer destroy tiles around the very edge of a map

  • Rock tiles destroyed by bombs no longer reappear on custom game load

  • Fixed dragantula’s swoop attack visual effect staying around forever if it is interrupted

  • Fixed shore crab’s tantrum ability sometimes causing it to get stuck

  • Fixed some obscure issues with fire ant bridges

  • Fixed rare crashes on saving & loading

  • Fixed rare crashes involving creature movement, pickup & death

  • Fixed rare crashes involving digging and chamber placement

  • Fixed rare crashes involving UI & minimap

  • Fixed The Other Foot victory cinematic

  • Fixed a broken texture on Causeway

  • Fixed an custom colony issue when selecting species that exclude Matabele or leafcutter units with controller

  • Inspect tool no longer closes when the tool is cancelled with keyboard & mouse controls

  • Fixed a crash when a corrupted custom game save meta file was present; the game now remakes the meta file instead

  • Rising seawater no longer shows in ant nest entrances

  • Fix (hopefully) for the Mac cursor issues

  • Several controller fixes

  • Fixed the custom game difficulty not showing up on the menu tooltip

  • Fixed an old bug where auras would show through faded terrain as squares

  • Fixed a tester credit issue

  • Various spelling corrections

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Sale1 Oct 2026Save 70% on Empires of the UndergrowthEmpires of the Undergrowth is now 70% off during the Hooded Horse Autumn Publisher Sale ! Command an ant colony and wage strategic battles in the insect kingdom. This ant-based RTS challenges you to build, defend, and expand your colony, using unique pheromone-based strategies and powerful warrior ants to overcome formidable foes. Hooded Horse AutumnPublisher SaleCommunity6 Sep 2026VLOG 20 - Freeplay Setup Saves, Modding (?!), Beta NewsFor the landmark 20th episode of the Empires of the Undergrowth vlog, we go over the changes that are coming to freeplay setup saving - including fun ways that saves can be edited for a bunch of different effects! We also discuss the burgeoning modding scene that is starting to appear for the game, much to our surprise! Finally, we go over what is coming in the soon-to-arrive beta, and also a l…Sale22 Aug 2026Save 70% on Empires of the UndergrowthEmpires of the Undergrowth is now 70% off during the Hooded Horse August Publisher Sale ! Command an ant colony and wage strategic battles in the insect kingdom. This ant-based RTS challenges you to build, defend, and expand your colony, using unique pheromone-based strategies and powerful warrior ants to overcome formidable foes. Hooded Horse August Publisher Sale