Streets of Rage/Bare Knuckle Final Boss: Mr. X

Sprite Stuff: Mr. X (Streets of Rage) by SXGodzilla on DeviantArt

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

Streets of Rage 4 “Mr. X Nightmare” DLC Adding Max Thunder, Mania+ Difficulty, and More

Streets of Rage 4: Mr. X Nightmare (Original Game Soundtrack) - Album by Tee Lopes

Streets Of Rage 4's Mr. X Nightmare Release Date Announced

Streets of Rage 2 - Mr.X in 30s

Streets of Rage 4 Mr. X Nightmare DLC to bring Shiva to the roster

Streets of Rage 4 Mr. X Nightmare DLC - 19 Minutes of Survival Mode Gameplay as Shiva - IGN

Streets of Rage 4''s 'Mr X Nightmare' is a dream not a nightmare

Mr. X Nightmare and free update hit Streets of Rage 4