You must eliminate all the figures (from 1 to 9) on a plate. On the line of the screen, a number is proposed to you and you must click on the figures of the plate until obtaining a sum equal to this number. For example, if the posted figure is 19, you can click on 9+9+1 or 8+7+4 or 6+7+4+2? Attention you have 10 seconds per a posted number. Easy way: keep the small figures to finish the table, do not eliminate them as of the beginning, they can be invaluable to finish. (Google Translation)