Rock Paper Scissors
Challenge the computer! Play a single round or go Best of 5. Win/loss stats tracked live.
Game Statistics
Theoretical vs your session (against random computer)
Your session
How to Play Rock Paper Scissors
Click Rock, Paper, or Scissors to make your move. The computer picks randomly after a short delay. Wins, losses, and draws are all tallied. In Best of 5 mode, the first player to win 3 rounds is declared the champion. Head to the Chance Games hub for more randomness fun.
Against a truly random computer, you should win about one-third of the time, draw one-third, and lose one-third. See the stats chart above to track how your session compares. For team games and group activities, try our group generators or random name pickers.
Strategy & Probability
Against a purely random opponent, no strategy improves your odds - Each outcome (win/draw/lose) has exactly a 1/3 probability. However, humans are predictably non-random. Studies show people throw Rock most often (~35%), followed by Scissors (~35%), and Paper least often (~29%). Expert players exploit these patterns by targeting Paper as a counter to the over-used Rock.
If you want a timer for timed rounds, use our interval timer or the classic stopwatch to keep sessions fair.
Fun Facts
- Rock Paper Scissors likely originated in China as "shoushiling" around the 17th century.
- The World Rock Paper Scissors Society holds annual world championships.
- Professional poker players study RPS to understand randomization and bluffing.
- Game theory's "Nash Equilibrium" for RPS is to randomly choose each option 1/3 of the time.
- Lizard and Spock were added by Sam Kass to reduce draws - Popularized by The Big Bang Theory.
Game Theory: Nash Equilibrium in Rock Paper Scissors
Rock Paper Scissors is a zero-sum game - Whatever one player gains, the other loses. Game theorists study it as a classic example of a non-cooperative simultaneous game. The mathematically optimal strategy, known as the Nash Equilibrium, is to play each option - Rock, Paper, and Scissors - Exactly one-third of the time using a truly random selection. Any deviation from this equal distribution can be detected and exploited by a perceptive opponent.
Humans, however, are poor random number generators. Research shows that Rock is the most commonly thrown choice on the first move, particularly among inexperienced players. Players who lose with one choice tend to cycle to the next in the Rock-Paper-Scissors sequence on the following throw. Experienced competitors study and exploit these behavioral tendencies rather than relying on pure randomness.
Use Cases
Rock Paper Scissors is commonly used to settle low-stakes disputes fairly - Deciding who pays, who picks the restaurant, or who goes first in a game. It is also used as a classroom icebreaker for any age group and as an introduction to game theory concepts including Nash Equilibrium, zero-sum games, and mixed strategies. Competitive players study it seriously enough that organized tournaments are held annually.
Frequently Asked Questions
What is the Nash Equilibrium in Rock Paper Scissors?
The Nash Equilibrium strategy in Rock Paper Scissors is to randomly choose each option - Rock, Paper, or Scissors - Exactly one-third of the time. This makes your moves completely unpredictable, meaning no opponent can exploit a pattern in your choices. Any deviation from this equal distribution gives a perceptive opponent an exploitable advantage.
Why do humans lose to computers at Rock Paper Scissors?
Humans are poor random number generators. People tend to follow recognizable patterns - For example, players who lose with Rock often switch to Paper on the next throw. Computers programmed to detect these behavioral patterns can exploit them in real time, leading to win rates well above the expected 33%.
What is the most common first move?
Statistical studies show that Rock is the most commonly thrown choice on the first move, particularly among male players. This makes Paper a statistically advantageous opening move against a random opponent who has not studied the game.
Are there Rock Paper Scissors tournaments?
Yes. The World Rock Paper Scissors Society has organized annual world championships with participants from dozens of countries. Competitive RPS strategy involves psychology, pattern recognition, and understanding behavioral tendencies rather than pure randomness.