If you're like Matt here and want to open every treasure chest in the game (as it were), the medal order was supposed to help with that but all the locked ones appear at the bottom so that's no use. @matt-likes-swords Let's just say, it might be worth taking a closer look at the following- 2, 3 (really need help with that one?), 6, 18, 22, 23, 25.