Cave-In

A Cave In is a resource in Survival 303.

Overview
A Cave-In is when there is a bunch of rocks fallen down naturally or on purpose to disallow/obstruct an entrance or exit, frequently used to hide mushrooms, chromium, and mithril, however it is also used for other purposes, including aesthetics.

They consist of a multitude of small stones, boulders, and cut stones that have been placed to blend in with the wall, sometimes overlapping, and they can only be collected using a pickaxe.