Abysm 2: Infernal Contract is a 2020 modification for Doom II that blends fast-paced shooter action with RPG elements inspired by titles like Diablo and Dark Souls. The core gameplay involves a hub-level progression where you complete quests, level up character stats, and upgrade weapons, all while maintaining Doom's signature run-and-gun style. This PC mod offers a deeper adventure structure than its base game, featuring two official expansions for extended content.
The gameplay loop centers around a hub-level progression system. Players navigate through interconnected areas where they undertake specific quests. This structure moves beyond simple level completion, encouraging exploration and objective fulfillment within the framework of the GZDoom source port.
The central innovation is the integration of RPG mechanics directly into the familiar Doom framework. While maintaining the core, high-speed shooting mechanics that define the parent game, players are now able to level up their stats, providing a tangible sense of character growth and customization over time. Furthermore, weapons can be upgraded, adding depth to combat preparation beyond finding new pickups.
As a total conversion mod based on Doom II, the atmosphere retains the dark, infernal setting inherent to its source material. The adventure aspect suggests a more structured narrative journey compared to the original game, guiding players through a sequence of challenges tied to the overarching contract theme suggested by the title.
This modification was released as a standalone package built for the GZDoom engine. As of the current date, the content package includes two official expansions that add further scope and challenges to the experience, extending the adventure beyond the initial release content. There are currently no reported DLCs or remakes associated with this specific release.
For veterans of the original shooter, this modification offers a significant shift in focus. It retains the visceral action but layers on persistent character development—stat increases and weapon enhancements—that reward long-term investment, moving it closer to an action-adventure RPG hybrid while preserving the essential "run and gun" feel.

Abysm 2: Spirit Falcon is an Expansion for the GZDoom mod Abysm 2: Infernal Contract. Includes a new singleplayer Campaign with new Weapons, Starting Equipment, Monsters and Quests as well as the Return of the Bounty system from Abysm 1.

Abysm 2: Pharaoh's Judgement is an Expansion for the GZDoom mod Abysm 2: Infernal Contract. Includes a new singleplayer Campaign with new Weapons, Monsters and Quests.