The idea of the game is to guess the secret gemcode. The code is a sequence of 4 colored gems chosen from available colors. You can change the color of a gem by tapping on it. When you have chosen the color for each gem you can tap the OK button.
After each guess you will get feedback in the form of green and red pearls: Green pearls indicate the number of gems that are of the right color and in the correct position, and the red pearls indicate the number of gems that are of the correct color but not in the correct position. Empty slots indicate that both, color and position are wrong. If you don’t get the right combination a new row for another guess will get visible.
When you guess the right combination You earn one gem on your gem account. When you have collected enough gem you will win new colors, meaning that guessing the gemcode becomes more and more difficult.