Well he didn't really hack it someone else did and he just plugged in the codes to his Codebreakers apparently and booted up KH2 and there was the battle. I think it's pretty cool to be Roxas dual-wielding keyblades against Sora. I wouldn't like Sora and Sora again Roxas though, he must've put a code that he couldn't die bc Roxas should have killed him multiple times when they was doing his special and throwing what appeared to be the nobody symbol at him.
That Roxas was one tough cookie it looked like too, huge amount of HP. That the Roxas that is in the Final Mix version in Japan maybe?
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