WhereIsCrystal app for iPhone and iPad

Like any casino, the game WhereIsCrystal is based on random events, but in contrast to casino, one can win the game!
If you have ever heard about the Monty Hall problem in the probability theory, you will be especially interested to play the game, as it demonstrates a solution to the problem. If not, guess the game secret on your own, and it will surprise you!
The main point of the game is as follows: a crystal is hidden behind one of the three doors, and you have to guess – behind which one. The guessing process has two stages. First: you select one out of the three doors. Then one door will be opened, there will be no crystal behind the door, but it will be not the door you have chosen. Second: you still have two closed doors, and you will have to choose one, behind which the crystal is hidden, in your opinion. If you find a crystal, you will get two coins. And every game costs one coin. You can get profit this way. Get 100 coins to go through the game!