You need to cool the processor of control of energy in hope that people can be evacuated. Gather lines of balls of one color. If a line consists of 4 or more balls, they disappear and clear out a place on the board. After completing each stage, you can see how many people you have already rescued.
Publisher description
...The emergency occurred at the distant space station and the cooling pods began to break out. If the processor of control of energy is overheated, then people will perish. You must remove balls from the cover of processor to lower its temperature. Then higher will be the temperature of processor, then more quickly the balls will be appear. To clean a processor, you must gather lines from a balls of the one color. You should be hurry, people hope on you.
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