Id didin't open source the game. They open sourced the game engine. So you can download gzdoom which is an open source port of the original doom engine, but you still need to own the original game for the game files in order to play it.
Id didin't open source the game. They open sourced the game engine. So you can download gzdoom which is an open source port of the original doom engine, but you still need to own the original game for the game files in order to play it.