Isopod Keeping Simulator

There is a real hobby, quietly large, about keeping terrestrial isopods: the pill bugs and roly-polies that curl into beads when startled. Isopod Keeping Simulator is what happens when that hobby's community, organized on Steam as Kunstaat, decides to turn its obsession into software. Released in April 2025, it is a semi-idle simulator about growing, feeding and caring for captive colonies, with one detail that reframes the whole purchase: one hundred percent of proceeds go to the charity New Incentives.

What the loop feels like

It starts as gardening with legs. You tend the enclosure, watching humidity and temperature, keeping a wet side heavy with moss and a dry side so the colony can regulate itself. The isopods burrow, path and socialize on their own schedule, often vanishing under leaf litter and bark for long stretches, and the population ticks upward while you mostly watch. That's Isopod Keeping Simulator.

Then population pressure arrives, which is the game's gentle punchline. A colony that thrives becomes too numerous, and you split it into new enclosures or sell the surplus, converting husbandry success into funds for better setup tech and rarer stock, up to prize morphs like the Rubber Ducky isopods the demo advertises. Every sale is simultaneously a cull, a payday and a donation. That's Isopod Keeping Simulator.

The systems doing the work

Enclosure and Environmental Management is the core: you monitor micro-climates, humidity systems and temperature gradients in a sincere attempt to mirror real invertebrate husbandry rather than cartoon management. Genetics and Morph Patterns give individual isopods distinct physical variations, encouraging bloodline tracking for rare and sensitive species. The Semi-Idle Progression Loop runs a passive tick under everything, colonies growing, multiplying and mutating over time.

Progression is Infrastructure Scaling, from starter plastic bins to advanced multi-parameter enclosures with serious moisture retention and ventilation, paired with Species Unlocks that trade hardy commons for high-value morphs with hyper-specific tolerances. The resource layer asks you to balance leaf litter, rotting wood and calcium and protein supplements so the colony stays fed without overfeeding into mold. The community's standing advice reads like actual forum lore: keep a moisture gradient rather than soaking the bin, don't over-interfere with the substrate because constant disruption stalls breeding, and cull or sell common morphs early before overcrowding crashes the ecosystem.

Where it stumbles

The community is clear-eyed about the trade. As a deep simulation it is barebones, and anyone expecting terrarium-tycoon scope will run through the systems quickly. The interface is clumsy in places, and interacting with enclosure elements can feel unintuitive. Mechanical quirks include feeding and breeding cycles that can stall after your first few sales, and minor physics bugs, isopods occasionally walking upside down along the terrain, that underline how small the project really is. Think experimental desktop companion with real husbandry homework, not a full management game.

Playing it today

It runs on Windows via Steam, with a free demo and an unusually gentle hardware load. In the same watch-something-live-on-your-second-monitor family, Rusty's Retirement farms your taskbar and Tiny Pasture raises a flock of desk pets, though neither donates its revenue to charity.

The verdict

Isopod Keeping Simulator is a lovingly specific community project about very small animals, doing measurable good in the world while asking very little of your afternoon. Buy it as a donation and keep it as a terrarium, and the thin systems stop mattering. Roly-poly philanthropy.