Digitsmith: Calcudoku & Kakuro

Digitsmith puts two classic number puzzles in one calm app: Calcudoku (also called Mathdoku) and Kakuro (cross sums). Every board is pure logic with exactly one solution. No guessing and no luck. If you get stuck, a helper shows what still fits and hints explain the next step. Calcudoku: a math puzzle in cages • Fill the grid so each row and column has every digit once • Each cage's digits must make its clue with +, −, × or ÷ • From a gentle 4×4 to 9×9, Easy to Expert • Expert boards hide the operation: the clue shows only the number Kakuro: a crossword made of numbers • Each run of white squares adds up to its clue, with no digit repeated • From 6×6 up to giant 20×20 boards A smart cage helper • Tap a cage or run to see every combination that still fits • Combinations that no longer fit are crossed out as you play • "Only way!" tells you when just one combination is left Hints that explain the logic • Each hint points to the next logical step and says why it works • "Show me" highlights the squares involved • The Technique Book keeps every trick you have learned A daily puzzle, twice a day • A new daily Calcudoku and daily Kakuro every day, easy on Monday and harder by Sunday • Keep a streak going; streak freezes cover the odd day you miss • Pure mode for purists: no helper, hints or checks • Share your result without spoiling the board More brain games inside • Killer Sudoku, Futoshiki and Zero Calcudoku • Endless mode for when you want just one more • 30+ achievements, stats and best times Made for comfortable play • Large text sizes and a high-contrast mode • Light and dark themes, a 3×3 or single-row number pad, left-handed layout • TalkBack reads every square: row, column, cage and notes • Plays offline, small download, and your progress stays on your phone Free to play Digitsmith is free with ads. You get free hints and checks every day, and can watch a short video for more. Ads never appear in the middle of a puzzle. Optional one-time purchases: • Remove Ads • Expert Pack: 9×9 and hidden-operation Calcudoku, 12×12 and giant Kakuro, and every past daily No subscriptions. Made by one developer who loves number puzzles.