Solid rock is a terrain type that makes up the unneeded space in the dungeon. It is possible to dig through one square of solid rock with a pickaxe or mattock, and several squares with a wand or spell of digging.

Most solid rock can be dug through, however the solid rock which borders the edge of the map cannot. This is to prevent needless digging of the map. Digging the edge of the map in the main dungeon will produce a message saying "This wall is too hard to dig into." In the Gnomish Mines, "Clash!" will instead be given.

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