Operation: Reckoning is a free to download add-on for Duke Nukem 3D: Plutonium PAK (version 1.4)/Duke Nukem 3D: Atomic Edition (version 1.5) that contains 35 new levels, new voice-overs, and weapon strength modifications. Operation: Reckoning was created with the EDuke32 source port, the Mapster32 level editor, and the Audacity audio editor. (Read the INFO.txt file for more information.) Included files: .bat file: OR.bat .exe file: eduke32.exe .GRP file: OPRECK.GRP .txt files: buildlic.txt GNU.txt INFO.txt Installation instructions: Step 1: Unzip the OR folder by right-clicking on it and choosing the "extract all" option. Step 2: Copy and paste the "DUKE.RTS" and "DUKE3D.GRP" files into the unzipped OR folder. Step 3: Double-click on "OR.bat" to play Operation: Reckoning. Operation: Reckoning was created by Macabre Conversions. Total development time: June 20th, 2013 - March 20th, 2015.