The Eyeballing Game is a wildly addictive way to test your ability to see and make shapes, lines, and angles. Created in 2008 by an Ontario carpenter, the game gives you three cracks at seven geometric tasks: bisecting angles, making parallelograms, and finding the midpoints of triangles, circles, and lines. Just as in golf, the lower your score tallies, the better you’ve managed these geometric quandaries. How accurate is your vision, when put to the test? Can you estimate the correct answers to these mathematical enigmas?