. The ingame currency carts turn in to the iap carts as you upgrade them.
. They do not appear to upgrade in to the real money cash carts.
. Getting in to the fourth chapter of the game will require a 20-24k investment just to buy a cart.
. The King Pig is best for challenges requiring certain scores or certain amounts of time airborne, use his balloon ability at the height of a jump for a seriously extra lengthy airborne trip.
. Best way of earning money? Versus. Choose a difficulty your comfortable with, tear up the tracks!
As stated above, I'm working on buying a cart for racing in the fourth chapter of the game.