there's actually 5 endings.

- Bad Ending : Spira gets owned if you don't defeat Shuin in time, there is a time limit to kill him.
- Sad Ending: Tidus hugs Yuna as a ghost and she accepts she will neves see him again, that's only if you really screw up, like didn't do enough missions and missed key events.
- Normal Ending: Yuna's on top of the ship with Rikku and Paine [FMV] Spira cheers for her and the three leaders tell a speech.
- Good Ending: You did everything right, you see the 'Normal Ending' and then the end fo FFX when Tidus pops out of the water, it continues on from there, they hug, I cried, life was good!!
- Best Ending: Attain 100%, have all the important events triggered during that game play, you see the Normal Ending, the Good Ending and then you see Tidus and Yuna in Zanarkand talking about WHY he's back.

Poof. 5 endings.