Repeated Prisoner's Dilemma Tournament
Compare reciprocal, punitive, forgiving, and exploitative strategies across repeated interactions.
Repeated Prisoner's Dilemma Tournament
How this teaches game theory
Complete scenario, mode, and level guide
Repeated interaction changes incentives because today's move influences how opponents behave tomorrow.
Strategy Duel
Compare two strategies directly over many rounds.
Round-Robin Tournament
Every strategy plays every other strategy; total payoff determines the leaderboard.
Evolutionary Tournament
Scores are converted into population shares, linking repeated games to evolutionary selection.
Strategies
Always Cooperate / Always Defect
Useful baselines that expose exploitation and the short-run temptation to defect.
Tit-for-Tat
Starts cooperative, then copies the opponent's previous move. It combines reciprocity and immediate forgiveness.
Grim Trigger
Cooperates until the opponent defects once, then defects forever.
Generous Tit-for-Tat
Usually reciprocates defection but occasionally forgives, making it more robust to noise.
Win-Stay, Lose-Shift
Repeats a move after a good outcome and switches after a poor one.
Levels
Level 1 — 20 Rounds
Short horizon for quickly understanding strategy logic.
Level 2 — 100 Rounds
Longer interaction makes reputation and retaliation more consequential.
Level 3 — Noise
One hundred rounds with accidental move flips, testing forgiveness and robustness.