Remain 1

Remain 1 (subtitled Chapter I) is a 11-level episode replacement for Doom II, released in 2007 by Alexander S. (Eternal). The maps are heavily inspired by their Doom 2 equivalents, albeit with a somewhat more realistic style.

A sequel, Remain 3, built for GZDoom, was released the following year.

Built-in demos
This WAD features two built-in demos. Both require Doom II v1.9 to view them. The demo levels are: