Game 10! online

The world of mathematics is not as peaceful as it may seem, in some places there is a tough fight for survival and the winner is the one who thinks quickly finds the desired number, and even more responsive to the situation. Your task - to remove from the field desyatochku and get this amount can be achieved by adding two numbers. Press the mouse on one figure, then the second, but do it very quickly, because you have to figure may suddenly disappear and in its place will rise a completely different, which does not suit you.