Game options

My 4year old loves the game. However, once we have gotten thru all the levels on the initial planets, we keeps wanting us to "buy" the two other locked planets. There is no way or option to unlock or purchase the other two planets... Please dont put options into a game you cant use until the developers decide to complete the game. The end user will ultimately be disappointed.

Beck1224 about Miles From Tomorrowland: Missions