Remove disc from box, insert FFVII discs, remove box, replace with FFVII box.

If you have to stick with X, do everything Psychotic said, but making sure to call Tidus Tie-duss instead of the annoying version they actually pronounce it.
Then remove anything considered a mini-game, and point the designers to FFVII, VIII and IX as a guide on what mini-games actually look like. If they refuse to give up their ways, force them to replay the Cloisters of Trials over and over, or dodge 2,000,000 bolts of lightning before allowing them to return home.
Replace Yuna with any other character in gaming history. Anyone.