Abandon 2020 is a mod for registered Wolfenstein, made by Thomas Weiling. It was released on April 13, 2020.
Essentially a cleaned-up version of 2004's Abandon, with the addition of most of the levels that did not make the cut but eventually turned up in 2006's Abandon v0.0, the set fixes some of the map errors from the 2004 original that often made gameplay difficult.
Graphics and sounds have been restored to the original Wolfenstein 3D atmosphere, as this was the original approach. The original storyline and map design was also based on the idea of seamless level flow, though this was not implemented in 2004.
Whereas Brian Lowe was responsible for the 2004 original's coding (in addition to map supervision where Lowe added health and ammo in critical situation and cleaned up some guard placements), Abandon 2020 instead uses an EXE made by AlumiuN which has been used first for Frantic Passages, and expanded with the release of KowTow.