This is "Portal 2: And the Abyss Gazes Back Part 1," a modification (Mod) released in 2016 for PC that extends the original physics-based puzzle experience. In this Mod, you utilize the portal gun mechanics to navigate deep, challenging environments within the Aperture Science facility, specifically focusing on its lower, abyssal sections. As Part 1, it offers a focused, user-created puzzle campaign built upon the established core gameplay loop, requiring spatial reasoning to progress through its unique, darker setting.
The atmosphere immediately shifts from the standard testing chambers. Players are thrust into a scenario where waking up is only the beginning of their troubles, as they find themselves plunged deep into the lower, perhaps forgotten, regions of the Aperture Science facility—specifically, the facility's purported "bottomless" pits. This suggests a darker, more confined, and potentially more perilous environment than typical testing scenarios.
As a puzzle game built on the Portal 2 engine, the fundamental mechanics revolve around the use of the portal gun to manipulate space, momentum, and physics objects to navigate complex environments. This specific installment focuses on presenting novel challenges within this established framework, demanding creative application of the portal mechanic to overcome obstacles presented by the deep, abyssal setting.
This release is designated as Part 1, indicating that the content is structured as an episodic narrative or a multi-chapter experience. Currently, there are no officially listed downloadable content packs or expansions associated with this specific Mod.
Access to this experience is exclusively available on PC (Microsoft Windows), requiring the base game to function, as is typical for content classified as a Mod.
The release date for this puzzle modification was July 19, 2016.