Decade is a map designed by Russell Pearson and released in 2004. It requires a ZDoom-compatible port. It uses the music track "Sinister" by Robert Prince. The level was constructed as a homage to celebrate that 2004 was Doom's tenth year. It is a "new school" map (using detailed architecture, ACS and other port features) constructed to be evocative of iconic areas from both Doom and Doom II.