MAYhem 2016 is a 21-level Doom II megawad for Boom-compatible source ports, created by members of the Doomworld forums in June 2016. It is the fifth installment in the MAYhem series, and the first not to be led by TheMionicDonut, with management taken over by Michael Fraize (Marcaek). Although the MAYhem WADs are traditionally made during the month of May, this time May was used for planning and organisation, with the mapping taking place during June instead. As a result, the WAD was sometimes referred to as Juneheim.
The WAD used a custom texture pack made up of resources from Quake, The Darkening Episode 2, and Malice. Two restrictions were used, with mappers having a choice of being limited to 160 things in their map, or having a monster count of the map number multiplied by 10. As the project did not receive a total of 32 maps, the latter theme is less pronounced with most of the maps made for that theme appearing in a different map slot than initially intended. For MAP31, the monster count was the map slot multiplied by 100.
Similar to MAYhem 1500, there was an extended period of little activity following the end of the mapping time. A last push to a final release was started in April 2017 and it was uploaded to the /idgames archive on 4 May. A bugfix update was released on 26 June.