Originally Posted by Tidus5
If you use the same number of coins each time, you create an 'echo' and the points multiply and rack up quickly. I beat Shinra on the first time because I used this. I reccomend using 3 coins each time. Its important to remember that if you stop using the same number of coins, the echo goes back to nothing and you have to start over again (sort of like the gunner's gauntlet). Since there arent many turns, its wise to keep on the same track. When you beat Shinra I think you get either an item or a cool dressphere (Im not 100% sure on that). Also, if you get enough echos in one game, you score the 'Treasure Hunter' dressphere which is rare and allows you to use thief skills anytime.
I hope this all makes sense! and P.S. why dont they ever say Tidus' name in X2? Its annoying!