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The map shows 39 breakable floors, one pin per floor, with the room and area. Each pin says whether a nail strike breaks it or it needs Desolate Dive.
Breakable floors by area: City of Tears (9), Kingdoms Edge (7), Waterways (7), Crossroads (5), Green Path (3), Crystal Peak (2), Fungal Wastes (2), Ancient Basin (1).
Breakable walls, and the walls the game names One Way Wall, are the layer Breakable Wall.
How the pins are read: objects named Break Floor with the break_floor script and objects with the quake_floor script; the stacked glass panes of one floor share a pin. The files hold 55 of them and 39 are placed on the map. Not placed: 14 floor objects sit in rooms without a map position (Godhome, dream and boss rooms) and are not drawn; 2 stacked glass panes share the pin of their floor.
Source: the game files of Hollow Knight, version 1.5.78 (Breakable Floor: 39 pins). These pages read the game files of build 1.5.78.11833 (2021). Steam now has 1.5.12620 (March 2026) with fixes and no new areas; PinDrop has not re-read that build.
PinDrop is fan-made and not affiliated with Team Cherry.
