➗ Missing Digits

Missing Digits shows an arithmetic equation with some digits blanked out. There is exactly one way to fill them so the equation is true.

How to play

Tap a blank digit slot and type the missing number.
Carries and column arithmetic are your friends.
Every blank filled correctly completes the puzzle.

Strategy tips

Start with the units column — single-digit results pin down what carries are possible.
The length of the answer is a strong constraint: a missing leading digit cannot make it too short or too long.
Fix digits that appear in two places first — they cross-check themselves.

FAQ

Is there always one answer?

Yes — each puzzle is generated so exactly one digit assignment makes the equation true.

Can a missing digit be zero?

Yes — unless it is the leading digit of a number, which can never be 0.

What operations appear?

Addition, subtraction, multiplication and division, depending on difficulty.

Difficulty affects grid size and time is your score — finish fast, post to the daily leaderboard, or race a friend.