Good luck with that ^^. 99% sure you couldn't do anything to MPGH. PHP isn't some retarted thing that can be hacked easily.
And this is Gaia, not some n00by website. They are SQL injection proof, and all data received is stripped of ' to prevent exiting the variable and entering the PHP itself. The only hope you have is a flash game. You could try stealing rich peoples accounts or something with a keylogger. PHP Games can be hacked, but not Gaia, they might have one or two security flaws though. ^^
If you think you could still hack it MagikBullet, go ahead and post it. Dave is an expert PHP coder, and I'm an average coder, and this is a professional forum board. So, like I said, good luck. ^^