Missing Digits: Math Puzzle

About

Uncover the hidden digits by reasoning, not guessing. 4■2 + ■8■ = 12■5. Guessing gets you nowhere. But follow the carry from the ones column, and the answer narrows to exactly one possibility. FUKUMEN does one thing: missing-digit arithmetic, done beautifully, forever. ■ Features - Endless puzzles, generated on your device From simple addition to full long multiplication with three partial-product rows. You will not see the same puzzle twice. - Exactly one answer, always Each puzzle starts as a completed sum, then digits are hidden — but only up to the point where a second answer would become possible. Every puzzle is verified before it reaches you. No unsolvable boards. No ambiguous boards. - Four difficulties Easy and Normal are addition. Hard and Oni are long multiplication. At Oni, 19 of the 26 cells are blank. - Today's puzzle One puzzle a day, the same one for everyone. Streaks and a calendar keep your history visible. - A real long-form layout Chalk on a blackboard, set vertically the way you'd write it by hand. Tap a blank, type a digit. The board scales up when the numbers are short. - Quiet help Columns that can't work out are tinted, gently — you can turn this off. And if you're truly stuck, a hint opens a single cell. - Records Puzzles solved, streak, average time, best time per difficulty. ■ Who it's for - Sudoku and crossword solvers looking for something that actually uses arithmetic - Anyone who wants to deduce rather than drill - Parents and kids working through missing-digit problems for entrance exams - People building a small daily thinking habit - Anyone who needs a puzzle that works with no signal — trains, planes, anywhere