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what do shinobi from PS2 and ryu from ninja gaiden have in coomon?
My friend said their brothers is this true?

I doubt it...

no.. shinobi is a sega genesis title created by sega... ryu from ninja gaiden is a character created by tecmo, which mostly spent its time on the NES (and possibly SNES)... if anything they were meant to rival eachother in the ninja gaming market.. although I have found some people enjoy'ed ninja gaiden for its extremely hardcore gameplay, others have enjoyed shinobi for its cool-factor