Entropy Sudoku

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entropy H ≤ Σlog₂|Cᵢ| – bits
solutions 2^HBethe –
marginal ΣH(Xᵢ) –bits
cells decided –
tree / depth –
refutations –
given derived hypothesis just eliminated
Click a cell to inspect its belief distribution.

Reasoning log

    Each node is a hypothesis. Click to load that belief state onto the board.
    Candidate reasoning moves at the selected node, ranked by expected entropy reduction.
    Graded test suite. Every puzzle is verified to have exactly one solution.

    Load from elsewhere

    Remote fetches need the other site to allow cross-origin requests. A puzzle can also be linked directly: append ?puzzle=…81 chars… to this page's URL.

    Click a cell and type 1–9; Backspace clears. Arrow keys move.

    Run reasoning strategies over the graded suite to compare them.
    strategies
    grades