Double Chest in Red Dragon Caverns
When you first get to the Caverns, go to the left, destroy the blue barrels, and on the right there will be a chest you can open, but you have to get close to it to see it. Open it, and you should get 300 koins. NOTE: Do this before the battles in the lab area where you fight Mavado. This works on my game, but I'm not sure if it works on any other game. I own the PS2 Greatest Hits version. Tell me if it works for you! Good luck!
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