Here's the cost of the premium version: $4.99
Here are features that are exclusive to this version:
1) you get 1 gold bar per every level beaten
2) you get 25 - 35 gold bars per every chapter beaten
3) infinite lives forever
4) events last forever
5) you always get the top prize on competitive events , regardless of what rank you landed on
6) no ads or IAPs
7) you get updates more fequently than the free version
8) an level editor with an built-in custom level browser ( you must have to beat the level without in-level boosters in order to publish it )
9) landscape supports comeback!!
