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GameShark Mod Method (No chip needed)
1) Remove the front of your Ps2, no biggie, they snap off. Insert the Gameshark 2 Cd, and put a Gs (GameShark) memory card in one of the slots, (don't matter which one)
2) In Gs options choose "start game" then "without", the screen should say something like 'Insert Game disk then hit X to continue"
3) This is where you gotta put in the disk, but DON'T press eject. Make sure the Ps2 doesn't register the fact that you opened the disk drive; this is how you do this...
3a) With a credit card or something of the like slide the white tab that is visible (since you opened the front fo the Ps2) all the way to the right.
4) Swap the Gs disk with the burnt disk
5) Push the tray back in gently, again DO NOT PRESS EJECT.
7) Get a strong paper clip or something to slide that white tab all the way back to the left again.
8) Hit X
9) The game might load a bit slower if you use a cheaper disk to burn the game, but it should work.