Crossdigit

Crossdigit is a math crossword-like puzzle game. Every clue is an equation; every answer is a number.

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HOW TO PLAY

Each numbered entry is a small math problem — 12 + 7, 84 ÷ 6, x² + 5 = 30 —
and the answer are the digits you write into that row or column. Crossing
entries share a digit, so a confident answer unlocks more clues.

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FOUR DIFFICULTIES

• Easy — addition and subtraction.
• Medium — adds multiplication.
• Hard — adds division.
• Extreme — algebra: linear, quadratic, and mixed equations to solve for x.

The grid size and answer-digit range are sliders you control. Start with a
6×6 grid of two-digit answers; ramp up to a 13×13 grid of five-digit
algebra. The puzzle generator makes a unique puzzle every time.

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DESIGNED FOR EVERYDAY LIFE

• Plays fully offline once installed.
• Pause anywhere — the timer freezes when you switch apps and your
puzzle resumes exactly where you left it, even after a force-quit.
• Light and dark themes that follow your system.
• No accounts required. A device-private ID lets you sync your stats and
earn a leaderboard rank without giving up an email.

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LEADERBOARD AND DISPLAY NAMES

Finish a puzzle and your time and score are weighed by difficulty and grid
size. Faster solves of harder puzzles outrank slower solves of easy ones.
Claim a globally-unique display name (changeable every two weeks) to stake
your claim on the global board, or stay anonymous — your choice.

A linking code lets you bring a second device into the same account
without an email or password. Generate a code on one phone, redeem it on
the other, and your stats merge.

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WHY MATH CROSSWORDS?

Crossdigit puzzles teach you to commit and verify — write a confident
guess, see what you get correct and adjust. Work your brain out with some mental math.

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PRIVACY

Crossdigit requires zero login. Anonymous gameplay uses a device-private random ID; the optional display name is the only thing other players ever see..

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Get it and get solving today!