CAMEL · Crossfigure Math Puzzle
Crosswords test your vocabulary.
CAMEL tests your number sense.
A crossfigure puzzle game where every clue is real number theory — GCDs, perfect squares, palindromes, primes, digit patterns — not arithmetic busywork.
Real number theory
Greatest common divisors, perfect squares, palindromes, primes, digit patterns — and sums that tie one entry to another. The same ideas that make number theory fun, as puzzle clues.
Always logic-solvable
No guessing required. Every published puzzle can be fully deduced from its clues alone.
Hints that teach
Stuck? Solve Step shows you the next logical deduction and explains whether it follows from one clue alone or needed the rest of the grid.
Four packs, your pace
From a gentle 2×3 introduction to dense, multi-step Hard Grids puzzles — plus a Daily Challenge, new every day.
Mini Grids · Easy
Square Grids · Medium
Compact Grids · Medium
Hard Grids · Hard
Daily Challenge · every day