CrossMath · one solution
An arithmetic crossword.
Lumath is a CrossMath puzzle: short equations run across and down and share the cells where they cross. Fill the blanks so every equation holds. Calm and quick at the start, genuinely hard at the top.
One small banner, never a full-screen ad · Exactly one solution · Hints that teach
Daily
One shared puzzle a day.
The same daily board for everyone. Keep a streak, earn freeze tokens that cover a missed day, and race the daily board.
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Play any past day
Missed one? Pick it from the calendar — and collect a trophy for a full month.
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Real players only
Leaderboards show real accounts. Follow the players you like and race them.
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Reveal
Each week a picture hides behind jigsaw pieces. Every solve reveals one, solo or with family.
Depth
Difficulty that goes somewhere.
Seven tiers from Beginner to Genius. Genius boards have 34 equations with brackets, powers, roots and factorials.
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Exactly one solution
A solver checks every puzzle first, so you never guess between two answers.
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Hints that teach
Nudge, Narrow and Strategy never give away a number.
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Pencil marks
Note the possibilities — a board filled in pencil finishes itself the moment it's right.
Get Lumath
Make every equation hold.
Free on iPhone and Android. One small banner — never a full-screen ad.