Halloween: The Game features 14 collectible "recordings" scattered across the six chapters of its story mode, letting players collecting them unlock extra story content and unique cosmetics not otherwise available. While gathering the collectibles isn't required to complete the game, they add an extra layer for players who enjoy full completion of a title.

The collectibles are spread unevenly across the game, with two recordings each in the Prologue, Chapter 1, Chapter 2 and Chapter 3, and three each in Chapters 4 and 5, adding up to the full 14. Each is tied to a specific location, such as shelves, dressers, desks, fireplaces and cabinets found inside houses, an inn, a music store and other map locations, with several recordings named after characters including Sheriff Brackett, Nurse Chambers and Laurie.