I've just realized that a game with over 1 million downloads (the ranking list is over 2 million people) has its solutions saved in the preference's file. So anyone with a rooted phone can access this file. This make me so fucking crazy: you make a stupid shitty game and get over 2 million users and don't even bother to make it good.
Now I have to decide whether to write to the developer to inform him that this is a stupid way to store the solutions or to make an app to let everyone know the solutions.