Underkeep Mushroom Quest: Demo and Full-Game Differences

Do not assume an old demo mushroom route gives the full-game quest’s exact sequence or outcome. The developer explicitly said the mushroom questline was brought into the full game with changes.

What is confirmed

The May 2026 update describes the demo questline as part of the expanding full game, with alterations. The free demo is a separate application, app 4346510; the released game is app 2411200.

That distinction matters when a guide names a recipient, an ending or an item location. A demonstrated demo choice is evidence for that demo, not automatic proof of a full-game achievement condition.

Continue from your own quest state

1. Check which application you are running.
2. Read the current quest text and the exact names of the relevant characters.
3. Count only the quest items actually present or acknowledged in your save.
4. Review the dialogue choices before handing anything over.
5. Preserve a separate save if you want to compare an uncertain branch.

These are version and quest-state checks, not an unverified mushroom-location walkthrough.

If a route does not match

Record the area, quest wording, collected items and last conversation. A location shown in older footage may have changed. Do not start consuming similarly named crafting ingredients just because another guide uses the word “mushroom.”

What this page does not promise

The evidence used here does not independently establish all full-game item positions, the best recipient, a complete achievement route or every later consequence. Those questions remain in the research backlog. A reliable follow-up needs current full-game footage or original documentation attached to the exact branch.