Fast-ish

Yes, math can be fun! And addictive. The gameplay is simple: choose the numbers from the grid that sum up to the number on top. That's it! Ohh wait. There is a time limit of course! Every time you tap a number on the grid, it adds to the previous sum of numbers tapped. Overshoot the number on top and you lose! You can cancel (subtract) any of the numbers you've tapped so long as you haven't overshot yet. Remember, Math and numbers are fun.