Goal of the game is to guess the hidden combination of gemstones using deduction and interpretation of previous results. Many levels with increasing difficulty.
Take gemstones from the box, and place them on the board. Once you make a combination you think is right click the ? button. You will get the coded results of your guess. Interpret results to improve you educated guess.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.