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The Hellbreaker level in Doom: The Dark Ages contains a single collectible to find. The 11th level is primarily a mech level, and the mech sections do not contain collectibles. Collectibles in Doom: The Dark Ages take the form of secret codex entries, toys, and weapon skins, which can be found in each level. The total number of collectibles is displayed on a tracker on the map screen.
Check out our Doom: The Dark Ages Collectibles Guides Hub for links to guides for every level.