Doom 2 -

A planned movie sequel titled Doom 2: Hell on Earth was permanently cancelled , leaving the franchise's second entry exclusively as a video game. Doom II (100%) Walkthrough (Map12: The Factory)

: In the final level, artists hid a severed head sprite of co-creator John Romero behind the boss wall. Romero discovered it and added a distorted, reversed voice clip saying, "To win the game, you must kill me, John Romero". doom 2

: While it used the same engine as the original, it introduced the Super Shotgun, which became the series' most iconic weapon, and doubled the variety of enemies. A planned movie sequel titled Doom 2: Hell