Learn it in a minute.
Then play it.
14 classic games, each with its rules, a worked example, real strategy and the idea underneath, and a board to play on right beside them.
All games
Continue where you left off
Learn an idea by playing it
Every game here is a small working model of a bigger idea. Pick the idea, and the board that teaches it is one click away.
- Binary and the nim-sum
- Constraint propagation
- Crossing constraints
- Hypothesis testing
- Information gain
- Linear algebra over switches
- Logical inference and probability
- Mixed strategies and pattern exploitation
- Planning under a shrinking space
- Powers of two and greedy strategy
- Recursion
- Solved games and minimax
- Threats, tempo and zugzwang
- Working memory
New here? Start with these
The quickest boxes on the shelf. Each one takes a minute to learn and a few to play.
- 2 min · 1–2 players Three in a row on a 3×3 grid. Perfect play always ends in a draw — can you get there? Rule one: Two players take turns. X always goes first, then O.
- 3 min · 1 player Three moves, no best one. Beat a computer that learns your habits. Rule one: Both players pick rock, paper or scissors at the same moment.
- 4 min · 1 player Flip two cards at a time and find every matching pair in as few moves as you can. Rule one: Every card has exactly one twin somewhere on the table.
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