In Omori, the Hangman Keys form an essential part of the main game's plot and puzzle, as well as being a collectible that can unlock a secret area in the Headspace map once collected. The keys are only found in Headspace, the setting for the dreamworld sequences of the game, and those crucial to the plot will be made obvious. However, the ones that make up failed guesses in the game played on Omori's computer are often hidden away.
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Some keys are only available via the Hikikomori route of the game, an alternate route of the plot that focuses on the dreamworld, and which is taken if you refuse to open the door to Kel when given the choice. Collecting every key requires a commitment to this route and to exploring every region of Headspace.
If you collect every key on the Hikikomori route, The Abyss will extend into a new, mysterious area.
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