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SIGIL 2 (tentative title) is a currently in-progress sequel to SIGIL by John Romero and Romero Games. It was announced through a video interview with Bridgeburner56 which premiered through the Realms Deep online indie games convention on August 15, 2021. It will be a Doom II megawad, and currently has at least one map either complete or in a stage of significant progress. No release date has yet been announced.
One of the levels, "One Humanity," was released as a standalone WAD for charity on March 2, 2022.
- (15 August 2021). "Sigil 2 for DOOM II Revealed." Blue's News. Retrieved 16 August 2021.
- Bridgeburner (6 July 2021). "Burning Bridges With Bridgeburner – #06 John Romero on the Art of Level Design." YouTube. Retrieved 16 August 2021.
- Romero Games Ltd. (20 September 2022). "Ask Romero | Episode 3." YouTube. Retrieved 21 October 2022.