Search for gold – Every location in the game has a number of hidden gold coins. For every three coins you find, you can buy one additional hint. So make sure to grab every coin you see.
Really stuck? – If you find yourself to be really stuck on a particular chapter, and you’re out of hints and gold coins, you can always restart the chapter and try again. However, keep in mind that you’ll have to replay the particular chapter from the very beginning, not just the location you were stuck on.
Running low on air – In later levels of the game, you’ll search for treasures under the sea. You’ll have to keep track of your air tank’s level, because if it gets too low, you’ll have to go back up to the ship to let your tanks refill. However, if you see air bubbles floating upward while underwater, click on them. Doing so will put a little bit of extra air in your tank.
These are just a few hints to help you out. If you have any other suggestions, post them below!