A unique and extremely addictive arcade game that develops reflexes and the ability to think and make decisions quickly. We are inside an object in the shape of a cylinder, along which eight rails pass along which, from the bottom to the top, colorful crystals move. Our task is to shoot them down as quickly as possible with the help of a special cannon fixed in the central part of the board.

As we can only shoot upwards, you need to skillfully control the whole object left and right by pointing enemy objects at the line of fire. Everything would be easy if it was not for the fact that crystals come in different colors (red, green and blue) to which specific keys are assigned. The matter becomes even more complicated when the colours begin to mix, and our eyes also see crystals in the process colours:

magenta, cyan and yellow. Then there is nothing else but to use the appropriate keystroke combination corresponding to the basic colours.