Code Breaker (Mastermind) — free online brain game for kids
Crack the secret colour code. After each guess use the ● right place and ○ right colour hints. 3 levels.
Free · no ads · no sign-up · works on phones · Age 8+
How to play
Crack the secret colour code. After each guess use the ● right place and ○ right colour hints. 3 levels.
Skills it builds
forming hypotheses, elimination.
New games
- Lights Out — cause and effect, planning
- Balance Puzzle — algebraic thinking, equations
- Odd One Out — classifying, visual attention
- Number Patterns — patterns, number sense
- Number Pyramid — addition and subtraction, working backwards
- Grid Memory — visual-spatial memory
More brain games
- Sudoku (4×4, 6×6, 9×9) — elimination, systematic thinking
- Futoshiki (greater-than sudoku) — tracking several rules, number order
- Nonogram (picross) — two-way deduction, patience
- Maze (8×8 → 25×25) — planning, spatial orientation
- Tower of Hanoi (3–7 disks) — recursive thinking, planning
- Sliding Puzzle (8, 15, 24) — sub-goals, sequencing
- Nim (strategy game) — strategy, thinking ahead, patterns
- Memory Sequence — working memory, attention
- Mental Rotation — spatial intelligence, visual reasoning
FAQ
Is Code Breaker (Mastermind) free?
Yes. No ads, no account, no app to install; it runs in the browser on phones, tablets and computers.
Do the puzzles change?
Yes, each round is freshly generated; pick the level with the buttons at the top.