Short answer: The "Nocturnal Missions" are the Episode 4–6 episodes of Wolfenstein 3D and are playable on the original MS‑DOS release and on modern re-releases/ports (PC/Steam and many console/mobile ports) that include the full Wolfenstein 3D package.

What the Nocturnal Missions are

The Nocturnal Missions are the three later episodes (Episodes 4–6) packaged as a prequel expansion for Wolfenstein 3D.

Where they originally ran

They were originally released for MS‑DOS as part of Wolfenstein 3D’s episodic structure, so the native platform at launch was DOS/PC.

Where you can play them today

  • PC (Steam): modern PC re-releases of Wolfenstein 3D commonly include the Nocturnal Missions in the complete package, so the Steam/PC release is a reliable place to play them now.
  • Emulated/ported platforms: many official ports of Wolfenstein 3D that bundle the full game (including the Nocturnal Missions) exist for platforms such as older consoles and mobile (examples include console and handheld ports listed in platform histories).
  • Fan recreations/mods: community projects (for example WolfenDOOM recreations) also reproduce the Nocturnal Missions inside other engines (like DOOM mods) for play on engines that support those mods.

How to confirm for a specific release

  1. Check the store page or packaging — it will state “complete” or list Episodes 4–6 / Nocturnal Missions if included.
  1. Look at release notes or community discussions for that port (Steam discussions often note whether Nocturnal Missions are present).
  1. For community mods, search the mod’s description (e.g., “WolfenDOOM: The Nocturnal Missions”) to confirm fidelity and included levels.

Quick example

If you buy the Wolfenstein 3D release on Steam that’s labeled the complete or classic edition, it includes the Nocturnal Missions, so you can play them on modern Windows PCs via Steam.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.

Would you like me to check a specific store/console edition to confirm whether that release includes the Nocturnal Missions?