Progress Update 11/29/2025

Last week we released 0.9.1! It was… somewhat less stable than we had hoped. In particular, the new cell division effect had a physics problem that caused frequent crashes. The first part of this week was dedicated to fixing this and a number of other bugs, with bugfix release 0.9.1.1 being released on Wednesday.

Nonetheless, there was still time left for development on future releases. Firstly, a few more bugs were fixed, including a few more cases where the auto-evo prediction showed NaN energy collected, and the industrial stage prototype being broken. Auto-evo was also further upgraded, now being able to place and upgrade Cilia. We also had a balancing round, in particular buffing some metabolisms, and toxin organelles.

These and more changes are currently planned to be released next week in update 0.9.2. So take a look below for the full list of changes, and we'll see you next week!

Programming

• New bugfix release: 0.9.1.1
  • Fixed microbe division animation trying to apply for detached physics bodies. This is likely the cause of the flood of crash reports we received.
  • Fixed various cases of the new MP system not working correctly
  • Fixed the new MP system to work correctly for multiple cell type edits in multicellular and macroscopic
  • Buffed prokaryotic toxin generation amount
  • Buffed iron and chemosynthesis
  • All multicellular species' hex layouts can now be previewed in the tooltips instead of just species that have been edited in the editor
  • Fixed error on switching patch in the multicellular editor
  • Fixed auto-evo calculating NaN energy gains for species (when a patch was empty of ammonia)
  • Fixed cells spinning around when they thought they were taking hydrogen sulfide damage but actually weren't
  • Fixed cell editor light level trying to apply too soon leading to major editor errors
  • Fixed MP multiplier difficulty setting not working with the new MP system
  • Fixed saving in wide locales with certain length strings
  • Fixed saving not working when there is a cell remove action in the edit history of multicellular
  • Fixed a case where the pilus collision system may have tried to access a dead entity
  • Suppressed already connected signal error popup (this is a years old engine bug)
  • Updated some code dependencies and added some testing helper code
  • Updated translations

• New DevBuild for our patrons:
  • Fixed multiple NaN auto-evo result problems
  • Fixed the industrial stage not working due to accidentally left in duplicate pause menu instance
  • Added turning speed to auto-evo calculations and it can now place cilia
  • Microbe movement speed now impacts how loud the movement sound is for the cell
  • Added an option to select on which monitor Thrive is on with it defaulting to auto to keep the old behaviour
  • Fixed GUI jiggle in the evolutionary tree by turning off GUI element snapping. Please report if you notice any text blurriness or other problems after this change.
  • Fixed environment tolerance sliders just not moving if not enough MP for the desired change. Now the sliders jump as far towards the desired change as there is MP left.
  • Added more collision safety checks everywhere collisions are recorded as 0.9.1.1 only added that safety for pilus collisions
  • Fixed too long text in the build commit hash being able to break the options menu
  • Updated code checking tools
  • Updated translations

Graphics

• Nothing substantial.

Gameplay

• Slightly buffed iron metabolism and chemosyhthesis to make them more comfortable to use.
• Buffed toxin generation to make toxin strategies more worthwhile.
• Auto-evo now knows about turning speed, and can place cilia to improve it.
• Auto-evo also knows about the pulling cilia upgrade being very useful for catching prey.
• Moving tolerance sliders around as much as your available MP allows is now easier, instead of freezing up when you click a position you don't have enough MP for.

Sound

• The cell movement sound now becomes louder the faster the cell is moving.

Theory

• Nothing substantial.

Outreach

• Nothing substantial.

Other

• Please welcome:
  • Our new Outreach Team Member: Pintarrolas!
  • Our new Tester: ImanProductions!
  • Our new Programmer: Jbsundown!