3 Parts
Doom: Mercury Rising is one campaign, but it is built and released as three parts — thirty-three maps, three narrative chapters, each aligned with a major shift in the story: leaving a region, returning from Hell, crossing into a new phase. Each part has its own map list, lore focus, and wiki pages.
10 maps
PART ONE
Mercury, first contact, and the road into Hell — plus a secret Venus map.
Read the chapter →
11 maps
PART TWO
The Northern Railway, excavation sites, and deeper Hell — including the Chase maps 14A / 14B.
Read the chapter →
12 maps
PART THREE
Caloris Complex, Cosmic Realm, Lazarus, and the campaign’s endgame.
Read the chapter →
The three-part split is not only a story choice — it is also a practical answer to how long truly finished SnapMap work takes. The full background (map build times, memory optimisation, staged 3×3 releases) lives on the Releases page.