Simple Senku game in Android.
The spheres are represented with RadioButtons. To make a move first touch the sphere to move, then touch the location. If it's a valid move it will be done, if not, a Toast will inform that the move isn't allowed.
When achieving the winning state, which has a single sphere standing in the center, a Toast will congratulate the user informing of the amount of moves and the time spent.
Starting point:
Completing the Senku: