Shadow Sum: Math Logic Puzzle

The labels have faded. The totals remain. Step into a quiet archive and reconstruct the values of mysterious symbols by comparing rows, regions and diagonals.

Every deduction opens another door. Use candidate notes, worked tutorials and clean high-contrast themes to reason through 200 verified grids. A symbol keeps the same value across a board, so a single discovery can unlock several clues at once.

Restore the curator’s exhibition, explore daily difficulty tiers and track your personal progress. Use free undo and optional explanations of the next logical step.

Play at your own pace. Includes English, Spanish and Brazilian Portuguese. Contains ads, with optional video rewards. Internet access is needed for ads; the campaign is designed for offline play.

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