Sudoku meets arithmetic — free online or as a large-print book
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Fill each row and column with 1..N (no repeats). Each outlined cage must combine to its corner target with + − × ÷. Tap a cell, then a number.
How Calcudoku works
Calcudoku (also Mathdoku or KenKen-style cage puzzles) fills an N×N grid with 1..N, each number once per row and column. Heavy outlines mark cages; the small clue in a cage corner is its target and operation (+ add, × multiply, − difference, ÷ divide). Numbers may repeat inside a cage. Every puzzle has exactly one logical solution.
+×
Prefer paper?
Large Print Calcudoku — 110 puzzles per volume (Easy to Hard), as a paperback (also in German).