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This is defined as any path that cannot be taken using Serenity and/or bypasses boundaries. For detection and killing only the score screen counts - "accidents" that don't show up there are allowed. Obake categories forbid detection, killing guards, and humans firing weapons. Run NG+ when creating a new category involving all items.
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All items are allowed from the beginning. Though all items are available when returning to NG, NG categories all use a fresh save. Death triggers are not boundaries (they do not stop the player on contact, rather they just kill the player) and can often be bypassed using Serenity (An example would be a laser covering a vent). A boundary is defined as a part of the level that stops the player on contact. *OoB is defined as any path that cannot be taken using Serenity and/or bypasses boundaries.
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NG Seals and Scrolls (48:01, Akitaka1) (Beat NG using all glitches and obtaining all seals and scrolls): NG No-OoB Obake (40:20, Akitaka1) (Beat NG without detection/gunshots/casualties and OoB*): NG No-OoB (38:36, Akitaka1) (Beat NG without OoB*): The sound cuts out at some point due to a copyright claim towards the end of level 9, it should kick in again once the song finishes loading, ChazneySR) (Beat NG+ without OoB*): NG Obake (27:27, Akitaka1) (Beat NG using all glitches without detection/gunshots/casualties): NG Any% (25:43, Akitaka1) (Beat NG using all glitches): NG+ Any% - (19:10, Akitaka1) (Beat NG+ using all glitches):