How to play
- Regular Sudoku rules apply: each row, column, and 3×3 box must contain the digits 1–9 with no repeats.
- Cages: the dashed outlines group cells into “cages”. The small number in a cage's corner is the sum its cells must add up to.
- No repeats inside a cage. Every cell in the same cage must hold a different digit — even though a cage is often smaller than a row/column/box.
- A cage with just one cell already tells you its value directly (the sum is the digit) — those are filled in for you on Easy/Medium.
- Use Notes to jot down candidate digits in a cell while you work out cage sums.
- A cage's border turns red if its digits so far can't possibly add up to its target — useful for catching mistakes early.
Solved! 🎉
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