
Hidden Cube locations
150 Hidden Cubes with 2,362 possible spots: Verteron 95 (87 on land), Altgard 3 (0 on land), Eltnen 26 (24 on land), Morheim 26 (24 on land). Each cube appears at one of its spots and opens with a Hidden Cube Key. The client places none on land in Altgard.
From the game files: client 2.0.6.0 hotfix 1 (Steam build 25800038, 2026-10-09)

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Verteron: 95 Hidden Cubes
1,440 possible spots.
Altgard: 3 Hidden Cubes
11 possible spots.
Eltnen: 26 Hidden Cubes
456 possible spots.
Morheim: 26 Hidden Cubes
455 possible spots.
Keys that open a Hidden Cube
Every placed cube asks for one of these items (EnvObjData RequireValues). Each item page says where to get it.
What a Hidden Cube can give (36)
Items whose route in the game lists Hidden Cubes (ItemGetRoute). The client holds no odds for them.