❓ How to play
Guess the hidden colour code. After each guess you are told how many pegs are exactly right.
🧠
Out of credits?Pass a quiz at 50% or better and earn 5 credits, that is what unlocks the next game.
Take a quiz →📘
Stuck on the topic?Read the step-by-step lesson first, then come back and beat the level.
Open a lesson →🎁
Playing as a guestCreate a free account to unlock levels 3 to 5, keep your progress and earn credits.
Register free →About Mastermind
Mastermind is a code-breaking game built on deduction: each guess returns feedback, and a good player designs the next guess to rule out as many codes as possible. Students in Class 9–10 and O Level practise testing hypotheses and keeping track of what they already know, much like a science investigation.
- Deductive reasoning
- Testing hypotheses
- Using feedback
For Class 9–10 and O Level.