Rock Paper Scissors

How to play

Click your choice — Rock, Paper, or Scissors. The computer picks randomly. Rock beats Scissors, Scissors beats Paper, Paper beats Rock. Toggle Lizard & Spock mode for the 5-way version!

Why Rock Paper Scissors is Still Worth Playing

Rock Paper Scissors has been played across cultures for centuries — versions of it appear in Chinese and Japanese folklore dating back to the 17th century. What makes it endure is the elegant structure: three choices, each beating one and losing to the other, with no dominant strategy. Against a truly random opponent (like this computer), every choice has equal expected value. But in a real game against a person, psychology takes over — people have biases, patterns, and tells. This version offers both: the classic 3-way game and the expanded Lizard-Spock variant popularized by The Big Bang Theory, which adds two more choices and ten possible outcomes while maintaining the same elegant balance.

Key Features

• Classic and extended modes: Toggle between the 3-way classic (Rock, Paper, Scissors) and the 5-way Lizard-Spock variant with a single switch — no page reload, same session scores.
• Truly random AI: The computer's move is determined by Math.random() with no weighting or pattern — every match is genuinely fair and unpredictable.
• Session score tracker: Wins, draws, and losses are tracked across your current session so you can get a sense of your actual performance over many rounds.
• Emoji-based interface: Large circular emoji buttons for each choice make the game instantly scannable on any screen size — no reading required to understand the options.
• Result explanation: Each outcome tells you exactly what beat what ("Scissors beats Paper") — useful for quickly learning the Lizard-Spock rules when you first switch modes.
• Reset button: Clear scores and start fresh without reloading the page — useful when switching between the two game modes.

Real-Life Use Cases

• Decision making: Can't choose between two options? Use RPS as a tie-breaker — the randomness is actually a feature here, eliminating deliberation paralysis.
• Probability teaching: This game is a perfect classroom demonstration of why 33.3% win rate is the expected outcome against a random opponent over many trials.
• Casual stress release: Sometimes you just want to click something and instantly know if you won or lost. Rock Paper Scissors delivers that gratification in under a second, every time.
• Learning Lizard-Spock rules: The extended mode is a fun way to internalize the 10-outcome rule set — play a few rounds and the relationships become intuitive.

Who Can Use This

Literally anyone. There's no learning curve — the three choices are universally known. Kids use it to practice decision making; adults use it for quick entertainment; programmers find it interesting as a game-theory example of a symmetric zero-sum game. The Lizard-Spock extension adds just enough complexity for people who want more than three choices without needing a rulebook.

Tips & Best Practices

• Against a random computer, there's no winning strategy: This isn't a cop-out — it's mathematically true. The expected win rate over any large number of games is exactly 33.3%. Focus on enjoying the game rather than trying to "figure out the pattern."
• Use Lizard-Spock to understand balanced game design: Each of the five choices beats exactly 2 others and loses to exactly 2 others. This symmetry is what makes extended RPS fair despite more choices — a beautiful example of balanced design.
• Human RPS does have strategy: If you ever play against a real person, know that beginners tend to throw Rock first (it feels "strong"), experienced players often default to Scissors, and Scissors is less common than Rock after a loss. These biases give you exploitable edges.
• Track your sessions honestly: The score counter gives you real data. If you're sitting at 32% wins after 50 rounds, that's essentially random — don't attribute it to bad luck or good skill.