This article or section contains information that relates to the non-canon game Pikmin Forever, which was created by Scruffy, a user on this wiki.
Acoustic walls are obstacles in Pikmin Forever. They are metal sheets mounted onto cave walls, built and positioned so precisely that one hit from a Rock Pikmin will resonate the entire cave, causing seismic changes that can alter the terrain. They can open up pathways but can also close some, and they always increase the chance of boulders or eggs falling from the ceiling. Sometimes more than one acoustic wall is present in one room, and each undoes the effects of another, to aid puzzle-solving. These obstacles increase the urgency of finding rubble for Rock Pikmin, as only their force can activate the acoustic wall.