The release is free, but you can spend big on a crazy special edition. John Romero — co-creator of the classic and influential 1990's first-person shooter Doom — has announced that he will release 18 new levels for the game for its 25th anniversary next year.
https://arstechnica.com/gaming/2018/...h-anniversary/
https://arstechnica.com/gaming/2018/...h-anniversary/