Rayman Fiesta Run just got a free update today across the App Store, Google Play Store, and the Amazon App Store. There's 16 new and invaded levels, a new boss fight, three new characters, and two new gadgets. Plus there's a new Nightmare Mode, which requires player to perform perfect runs through 36 invaded levels. Die and you have to restart from the beginning.
Again, this is a free update, something I feel strange about having to reiterate but that's the day and age we live in with games. Rayman Fiesta Run is available for $2.99 on all the above stores mentioned, as well as Windows 8 stores.