Mycelarium Hedgehogs: Why They Steal Mushrooms

Mycelarium, the Steam game by PLAN KAPKAN, places part of your fungal run on a calm pixel-art forest surface where hedgehogs are part of the world—not a separate boss fight. If you grow surface mushrooms or other fruiting bodies above ground, their safety from surface visitors is a real planning question, especially before you spend food on a new cap.

Why do hedgehogs steal mushrooms in Mycelarium?

PLAN KAPKAN’s world blurb states that hedgehogs wander across the surface while you push mycelium underground. Verified That is lore framing, not a step-by-step combat tutorial. The forest is described as alive but not hostile; fallen leaves rot into food, and trees may become future nutrients. Verified

In third-party Demo footage (before Demo 2.0, when Repeller was not available), a hedgehog picked up a player-built mushroom, carried only one mushroom at a time, and left with it. Observed in Demo Demo footage by Gloworm (YouTube) is the source for those behaviors; release builds may differ.

An official Steam screenshot shows a brown hedgehog with a small red-and-pink mushroom on its back at the start of a run (food 50, distance 0 cm, water 60, star 0). Verified The image only proves the animal can appear with a mushroom on its back—we do not treat that mushroom as proof of a theft on frame one.

Surface mushrooms in another official shot include orange and pink caps with white particles rising above one cap—useful context for what you are trying to protect, not proof of hedgehog interaction. Verified

What did the developer add in Demo 2.0?

The DEMO 2.0 is OUT! Steam news post (2026-10-30) lists four changes. The first is unlocking the Repeller mushroom to counter that sneaky Hedgehog. Verified The same post adds new visuals, implements a save system, and tweaks balance. Verified

Demo 2.0’s Steam news lists the Repeller mushroom as an unlock in that update. Verified How far into a run you reach it, and what it costs, is not documented. Not announced Let’s Play clips filmed before 2.0 will not show it. Full-game timing is planned for 2026-11-03 on Steam, with the developer wording hopefully November 3rd, not a guaranteed minute. Verified

What is the Repeller mushroom?

On the official UPGRADES screenshot, Repeller Mushroom sits under Spore Mushroom on the Fruiting Bodies branch, with child nodes Repeller Charges and Repeller Regen Cost below it. Verified Demo 2.0 explicitly ties this unlock to hedgehogs. Verified

What Repeller does in play—radius, duration, cooldown, food cost, or point cost—is not announced. Not announced We do not describe it as a guaranteed shield.

For how Spore and Repeller sit beside Predator and Tree types, see the mushroom types guide and the full upgrade tree breakdown.

What do the Repeller Charges and Regen Cost nodes do?

The upgrade tree names Repeller Charges and Repeller Regen Cost as nodes under Repeller Mushroom. Verified PLAN KAPKAN has not published tooltips, dev logs, or patch notes explaining charge counts, regeneration timing, or point costs. Not announced

Red numbers appear beside some other Fruiting Bodies nodes in screenshots (for example 3 next to Predator Mushroom). Official sources do not define those digits; this page does not treat them as Repeller costs. Verified

What can you do about hedgehogs right now?

Verified: Read the Demo 2.0 notes and unlock Repeller in your own save if you are testing the Demo. Observed (pre-2.0): Expect that a wandering hedgehog may remove one surface mushroom per interaction. Observed in Demo

Inferred, not official: It probably helps to finish the beginner hyphae loop so you can rebuild caps without guessing, and to open the upgrade tree early enough to see whether Repeller Charges or Regen Cost are affordable once you earn points. Inferred We are not ranking upgrades or promising a theft-free route.

Still unknown: hedgehog spawn rate, pathing, whether multiple hedgehogs exist, whether Repeller fully prevents theft in Demo 2.0, and whether stolen mushrooms can be recovered. Not announced

After you patch to Demo 2.0, your own session is the best check for Repeller—this wiki snapshot (2026-10-31) relies on official text and pre-2.0 footage for theft behavior, not a fresh Repeller playtest.