✊ Rock Paper Scissors
Play rock-paper-scissors against the computer. Choose rock, scissors, or paper and keep track of your wins as you play — a quick way to kill time or get some practice in.
How to use
- Choose rock, scissors, or paper.
- Your choice is compared against the computer's, and the result is shown.
- Your win/loss record accumulates, so you can track your standing over repeated games.
How the calculation works
Play rock-paper-scissors (janken) against the computer. Press rock, scissors or paper; the computer picks a hand at random, and wins, losses and draws are recorded. The computer chooses each of the three hands with equal probability (1/3 each), so whatever you play, winning, losing and drawing each have a 1/3 chance. Wins, losses and draws are counted on screen and can be reset to zero.
Worked example
One round Win 1/3, lose 1/3, draw 1/3 Three wins in a row: (1/3)³ = 1/27 (about 3.7%) Excluding draws, your win rate approaches 50% over many rounds.
Things to be aware of
- People are known to have patterns in the hands they choose, but the computer here is random, so no strategy improves your odds.
- Rock beats scissors, scissors beats paper, and paper beats rock.
- The record is cleared when you close the page.
FAQ
Does the computer choose randomly?
Yes — the computer's move is chosen randomly without favoring any particular pattern.
Can I reset my win/loss record?
Yes — use the reset button to clear your wins, losses, and draws.
Can I play alone to kill time?
Yes — since you're playing against the computer, you can play any time without needing another person.
What happens on a tie?
A tie doesn't count as a win or loss — it's tracked separately as a draw.
Is there a limit to how many rounds I can play?
No — there's no limit, so play as many rounds as you like.