Hacker Gets Doom Running Inside Doom
A hacker has somehow managed to get the classic FPS game Doom to run inside another game of Doom.
Youtuber and Doomworld community member kgsws posted a video on Youtube showing the technical achievement in action.
This is only possible on the original DOS copy of Doom 2 due to an exploit that enables code execution inside the game.
He also got the game Heretic running inside Doom.