Payoff Matrix Visualizer

Interactive 2-player game theory. Edit any cell of the payoff matrix and watch pure and mixed Nash equilibria update in place. Toggle deviation arrows to trace best-response dynamics, run Monte Carlo simulations off the main thread, and share a permalink that hydrates the exact matrix state.

Free and browser-based. No account required. Presets include the Prisoner's Dilemma, Stag Hunt, Battle of the Sexes, Matching Pennies, and Rock Paper Scissors.