Is Mastermind free to play online?

Yes. It's completely free, with no signup and no ads in your way. Just open the page and play.

Can I play Mastermind on my phone?

Yes. It's built mobile-first and works in any modern browser on phone, tablet, or desktop. You can add it to your home screen and it even plays offline.

Where should I go if I just want the rules?

The how-to-play page covers the rules, what the feedback pegs mean, a worked example, and simple strategy.

Mastermind Online - Play the Free Color Code Game in Your Browser

What it is

How it relates to Mastermind

This is a web version of the classic board game Mastermind (also known as a color code-breaker): one player — here, the computer — sets a hidden code, and you deduce it from the feedback after each guess. It keeps the original rules and adds a daily challenge, streaks, and modes that make it easy to pick up and hard to put down.

Same deduction you know from the pegboard classic — no box, no setup, nothing to lose.

Who it's for

Which players is it for?

People who like logic puzzles and want a quick, thinky break: fans of the physical Mastermind board game, players hunting a good daily puzzle, and anyone who enjoys deduction and process of elimination. If Wordle-style dailies are your thing, the color-code version scratches the same itch.

Why online

Why play it in the browser?

No download, no signup — open the page and play.
Works everywhere — mobile-first, but great on desktop too.
Add to home screen — installs like an app and plays offline.
Spoiler-free sharing — share your result without leaking the answer.

Get started

Where do you begin?

New to the game? Read how to play first. Want to see the options? Browse the modes. Or just open the game and start with today's daily challenge.

FAQ

Frequently asked questions

Is it free?

Completely free — no signup, no ads in your way. Just open and play.

Does it work on mobile?

Yes — it's built mobile-first, works in any modern browser, and can be added to your home screen to play offline.

I just want the rules — where do I go?

The how-to-play page covers the rules, feedback pegs, a worked example, and strategy.

Ready when you are — jump into the game, or read up first.

Play the game How to play See the modes

Mastermind online: play free in your browser