There are plenty of unlockables in Rayman Fiesta Run, including different characters, and helpful boosts, such as hearts that protect you from damage, and a racing line, which shows you the best route to take through a level. These boosts and new characters are paid for in Lums which, of course, you can purchase for real money, as well as winning them in the game. In-app purchases are not a necessity in Rayman Fiesta Run because replaying levels to gain more Lums isn't a chore, such is the fun nature of the gameplay.