Missing Digits: Math Puzzle

About

Guessing won't fill the blanks. Logic will. Follow the carry from the ones column, and every hidden digit narrows to a single answer. Missing-digit arithmetic and classic cryptarithms, in one quiet app. ■ Missing digits Part of a written sum is hidden. Fill in the blanks so the arithmetic works. - Easy: column addition - Normal: addition and single-digit multiplication, chosen so you can't just subtract your way through - Hard: long multiplication with partial products - Oni: 4×3-digit and 5×2-digit long multiplication Puzzles are generated on your device, so you never run out. ■ Cryptarithms Letters stand for digits, as in SEND + MORE = MONEY. Same letter, same digit; different letters, different digits. 119 puzzles built from everyday English words. ■ Exactly one answer Each puzzle starts as a completed sum, and digits are hidden only while a single answer remains. Every cryptarithm was chosen because it has one solution. No unsolvable boards, no ambiguous ones. ■ Today's puzzle One puzzle a day, the same for everyone. Weekdays are Normal; weekends are Hard long multiplication. Your streak and a calendar keep your history visible. ■ Ranks Earn points as you solve and climb from 10th Kyu to Master. Harder puzzles are worth more, and everything you've solved already counts. ■ Quiet help - Columns that can't work out are gently tinted (you can turn this off) - If you're truly stuck, a hint reveals a single cell ■ Chalk on a blackboard Deep green board, chalk-white digits, set vertically the way you'd write by hand. The board scales up when the numbers are short, and lights up gold when you solve it. ■ Great for - Sudoku and crossword fans who want puzzles that actually use arithmetic - Anyone who'd rather deduce than drill - Kids preparing for entrance exams, and their parents - Building a small daily brain-training habit - Playing on planes and trains with no signal ■ Privacy - No account required - Your records stay on this device - Puzzles are created inside the app; no connection needed to play - No ad SDKs, no tracking - To show other apps by the same developer, the app reads public App Store listings only. None of your data is sent