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To win the game you must kill me, John Romero

DOOM II was released on 30th of September 1994. There were no big changes, but it still has some innovations.
Instead of having episodes, DOOM II has 32 levels, which's 2 levels are secret. There were more monster types added and Doomguy got himself a new gun: Super Shotgun.
Unlike DOOM, which was initially only available through shareware and mail order, DOOM II was a commercial release sold in stores.
Developer team didn't change, except Tom Hall, who didn't participate in DOOM II development.

In addition, DOOM II has 2 expansions:
• Master levels for DOOM II (1995)
• No Rest for the Living(2010)

Master Levels for DOOM II consists 21 levels made by different modders.

No Rest for the Living was developed by Nerve Software for the release of Doom II on Xbox 360.