The dream of gems falling from the sky will come true right now, if you take the opportunity and play the game Stop Drop. For the virtual world, gems are ordinary multicolored crystals that can be used as game elements. You will find yourself in a crystal rain, but it will not harm you, it's only good if you manage to cope with the task. Down on the horizontal surface there is already a scattering of stones, but its configuration will change constantly. Your task is to remove all the falling stones except those that are similar to those lying below. The number of falling elements will increase, and, therefore, the task will become more complicated and you will be able to demonstrate the ability to respond quickly to changing circumstances.