Gold Bars are the main currency of Cascade.
You can find Gold Bars by earning Stars on levels. Achieving the first Star goal in a level will award 5 Gold Bars. 10 Gold bars are awarded for the second, and 15 are awarded for the third.
You can also find Gold Bars by tapping on Dig Spots and purchasing from the Store.
Gold bars can be used to purchase Boosts and Tricks, refill Lives, and much more.