Path on Rails app for iPhone and iPad

Path on Rails is a puzzle game where you have to make the correct path with the available elements so that the rolling balls are guided to the fire targets. There are a total of 50 levels divided into 5 chapters and in each chapter you unlock an extra element.
At the beginning of each level there is a board with the start and end elements in a fixed position and your goal is to combine and locate in the correct place on the board, your elements. When you are done, you release the rolling balls and if the path you made is correct, the rolling balls reach the final elements and the level is completed. Then and only then, you unlock the next one. Totally there are 6 different elements that are getting available as you proceed at the game.
In the game there are game-coins that you can use for help. Each game-coin reveals the location of an element in a certain level. You start the game with an amount of game-coins and additionally you earn one game-coin by completing each level. Of course there is the option to buy some additional game-coins with real money as an in-app purchase.