John Romero’s Sigil is a spiritual successor to the original version of Doom PolygonJohn Romero gifts 'Doom' 18 new levels for its 25th birthday EngadgetJohn Romero's about to make you a gift Rock Paper ShotgunOwn a statue of John Romero's head on a spike with the Sigil collector's edition PC Gamer‘Doom’ Creator John Romero Is Making 18 New Levels For Original Game VarietyView full coverage on Google News