The secret room vent
Developer Radosław wrote on the Steam forum that the basement vent into the secret room opens after the greenhouse is at 100%. Watching the ending movie closes that vent for good unless you start a new game. Infiltrator, the achievement for getting in, sat at 84.4% on 4 Nov 2026.
What the developer actually wrote
The reply is specific: the vent that joins the basement to the secret room waits on a finished greenhouse. It is not “somewhere after the basement” in a vague sense. People searching “after basement” are usually stuck on this vent, or on the shed-roof door that the basement also opens. Those are two different doors.
Crouch is a separate gift. The swings, once finished, give you the duck (CTRL on a keyboard in the guides). Without that duck you can see the vent and still not fit. The path the replies describe is: basement from the shed side, walk to the rear wall, duck, crawl.
After the ending animation the vent stays shut. If you wanted Infiltrator and you already rolled credits, the developer’s answer is a new game, not a reload of the same ending.
Video
Leaf It Alone secret room. Click the preview to load the YouTube player.
Questions
I finished the basement and the vent is still shut.
The developer’s condition is the greenhouse at 100%, not the basement itself. The basement is only the hallway that contains the vent.
Related: Area orderPhotosInfiltrator is an objective
Sources
Limitation: The vent rule comes from the dated developer reply and may change in a later patch.
- Steam discussion: developer reply on the secret room — checked 2026-11-04
- Steam global achievement list — checked 2026-11-04
- Leaf it Alone Wiki garage and vent — checked 2026-11-04