Back to Saturn X

The story begins after contact with the Saturn X research station is suddenly lost. Weeks later, a space marine is sent on a three-year expedition with no hope of return, tasked with finding out what happened at the distant base near Saturn.

Most of the action takes place inside the station's vast complex. The levels are designed in a futuristic style with a wealth of new textures and graphical assets that evoke the atmosphere of a space base, at times reminiscent of Quake II's aesthetic. The mood is further enhanced by an original MIDI soundtrack inspired by the synthwave and synth-rock of the 1980s.

Despite the abundance of new visual assets, Back to Saturn X preserves classic Doom gameplay. There are no new monsters or weapons — the focus is firmly on thoughtful level design and combat encounters. The maps are large enough to reward exploration, yet remain readable and rarely leave you hopelessly lost.

Difficulty escalates gradually: the early levels are relatively straightforward, but before long you will face tougher threats such as arch-viles and cyberdemons. The levels frequently make use of clever scenarios — corridors littered with enemy corpses that arch-viles can resurrect, or hub areas styled as train stations connecting several missions.

The megawad is primarily balanced around the Ultra-Violence difficulty setting, though all difficulty modes are fully implemented. Maps are balanced for pistol-start play but allow continuous progression as well. Additional enemies and resources have been added for cooperative play.

Overall, Back to Saturn X stands as one of the most expansive and atmospheric projects ever made for Doom II, blending classic gameplay, sprawling levels, and a unique retro sci-fi feel of a space station orbiting Saturn.