Freaking Sum description

The new game of the series "We love numbers"!
The game requires maximum attention and speed of decision!
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You need to find a sum equivalent to the given random number by plus from number 1 to 9 and do it very quickly. With each level, some certain number is randomly disabled - will have to try, to show the best results!
Compare your result with others in the global table of results !
Example 17: press 4 , press 6, press 7;

Enjoy the game!