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While V4 is a staple version, newer iterations like V9 have since been released, offering even larger rosters (up to 78+ characters) and further technical refinements.
Jujutsu Kaisen Mugen V4 is a popular fan-made 2D fighting game built on the M.U.G.E.N engine. It is celebrated by the community for bringing high-action, "limitless" combat to both Android and PC. The Story of the Game