While Idle Space is completely free to play, we do offer the option to purchase in-game currency (Crystals) for real money, which can be done through the game itself. The purchases are handled entirely by iTunes and Google Play, in order to ensure the safety of your personal and financial information.
It is very important for us to give all our players the ability to choose how they would like to play the game, therefore every area of the game is equally accessible to players as they progress, regardless of whether they invest real money into it or not.