✊ Rock Paper Scissors
Play the classic hand game against the computer and track your score.
What is this tool?
Rock Paper Scissors is a hand game played between two people, or between a person and a computer, in which each player simultaneously forms one of three shapes with their hand. The shapes are rock, represented by a closed fist, paper, represented by an open flat hand, and scissors, represented by a fist with two fingers extended. The outcome is determined by a simple set of rules: rock crushes scissors, scissors cuts paper, and paper covers rock. If both players choose the same shape, the round is a tie and is usually replayed. The game originated in China during the Han Dynasty around 2000 years ago and spread to Japan, where it was formalized and popularized. It is known by many names around the world, including Jan-Ken-Pon in Japan, Pierre-Papier-Ciseaux in French, and Piedra-Papel-o-Tijera in Spanish. Despite its apparent simplicity, Rock Paper Scissors has interesting strategic depth when played repeatedly. Game theory shows that the optimal strategy is to choose each option roughly one-third of the time at random, which makes the game unexploitable. However, human players are notoriously bad at generating truly random sequences, which means a clever opponent can detect and exploit patterns in your choices. The game is commonly used as a fair and immediate decision-making tool, as a tiebreaker for minor disputes, and as a fun competitive activity. It has even been used in high-stakes situations such as art auction house decisions and legal case settlements.How it works
The game uses a random number generator to simulate the computer choice, ensuring that each of the three options has an equal one-third probability on every round. When you click one of the three buttons for Rock, Paper, or Scissors, the tool immediately generates the computer choice and compares it to yours. The comparison follows the standard rules: rock beats scissors, scissors beats paper, and paper beats rock. Identical choices result in a tie. The tool displays both choices, announces the round winner, and updates the running score tally showing wins, losses, and ties. Because the computer choice is truly random, no pattern in your play can be exploited by the computer, and each round is an independent event. The score persists across rounds so you can play an extended session and see how you perform over time.How to use
- Click one of the three buttons: Rock (closed fist), Paper (open hand), or Scissors (two fingers).
- The computer simultaneously makes a random choice from the same three options.
- The result appears showing both choices and the round winner based on the classic rules.
- Your score is automatically updated in the wins, losses, and ties counter.
- Keep playing as many rounds as you like. Try to find patterns or just play for fun. The score persists across all rounds.
Frequently Asked Questions
Frequently Asked Questions
Is there a winning strategy for Rock Paper Scissors?
Against a truly random opponent, no strategy gives you an advantage, as each option has an equal one-third chance of winning. However, against human opponents who are not perfectly random, research shows that players tend to repeat winning moves and change losing moves. A simple effective strategy is to play whatever would have beaten your opponent last move if they lost, as they are likely to switch.
What are the odds of winning each round?
Ignoring ties, each round has an equal probability: you have a one-third chance of winning, one-third chance of losing, and one-third chance of tying. Over many rounds against a random computer, your win rate should approach 33 percent wins, 33 percent losses, and 33 percent ties. In practice, you need to win about half of the non-tie rounds to come out ahead.
Why do I keep tying?
Ties happen when both you and the computer choose the same option. With random computer play, ties occur about one-third of the time, which is perfectly normal. If you are tying more often, it may be because you have a subconscious preference for one option. Most humans pick rock more often than the other two options, a tendency some opponents can exploit.
Can the computer predict my moves?
No. Our computer uses a simple random number generator, so it cannot detect or respond to patterns in your play. Each round is independent. However, in games against humans, skilled players can detect patterns, so mixing up your choices unpredictably is the best way to avoid being exploited in competitive play.
Tips & Advice
While the game seems purely random, there are psychological patterns you can exploit when playing against humans. Studies show that people who win a round tend to repeat their winning choice, while people who lose tend to switch, often moving to the choice that would have beaten what just beat them. Knowing this, after winning, you can predict your opponent might play what you just played, so play what beats that. The best overall strategy is to be as unpredictable as possible, mixing your choices evenly across all three options. Avoid having a favorite choice, as opponents can detect and exploit a bias. For casual fun against the computer, just enjoy the randomness and do not overthink individual rounds. The game is a great quick decision-maker for settling minor disputes between friends.