Mr. X by CosmoBuggi on DeviantArt

Streets of Rage 3 (Part 4) - IT'S MR. X!!!! --- WAIT A MINUTE

Sigma Posting on X: Mr. Σ Source: Mr. X Streets of Rage 2 (Genesis) by Sega, Ancient, MNM Software, Shout! Designworks and H.I.C. / X

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Streets of Rage 4 “Mr. X Nightmare” DLC's Final New Character Revealed – NintendoSoup

Shiva joins the playable roster of Streets of Rage 4: Mr X. Nightmare – Destructoid

Streets of Rage 4 Mr. X Nightmare DLC impressions: More of a dream come true

Streets Of Rage 4 : Mr. X Nightmare Review (PS4) - The Best Side Scrolling Brawler Just Got Even Better - PlayStation Universe

Streets of Rage 4 Mr. X Nightmare DLC adds three new playable characters

Streets of Rage 4: One Year Later..The 'Mr. X' Nightmare Begins. — RGN 99

Streets of Rage 4: Mr X Nightmare DLC