Catkuby Raimon Parreño Today's Catku Play and print How to play The books Español

Paper-and-pencil puzzles

Every puzzle checked one by one

Six puzzle books, and a free puzzle to print every day

Every grid in these books was generated and checked by computer before it was printed: one solution, found by actually searching for it, and solvable by reasoning. The ones that failed either test are not in the books.

Classic sudoku, 16×16 sudoku, killer sudoku, nonograms, kakuro — and the catku, a puzzle that did not exist before: a house seen from above, where you have to find the cat.

Play today's Catku

Free, to print

A new one every day, no sign-up: Sudokus to print · Killer sudokus to print · 16×16 sudokus to print · Kakuros to print · Nonograms to print.

The puzzle books

Cover of 202 Sudoku

202 SudokuFive levels of difficulty, from easy to impossible

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Cover of 127 Sudoku 16×16

127 Sudoku 16×16Five levels of difficulty, from easy to impossible

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Cover of 202 Killer Sudoku

202 Killer SudokuFive levels of difficulty, from easy to impossible

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Cover of 101 Nonograms

101 NonogramsFill in the squares and find the picture

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Cover of 152 Kakuro

152 KakuroCross sums, from easy to impossible

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Cover of 102 Catkus

102 CatkusFind the Cat: a new kind of logic puzzle

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Cover of 52 Autodefinidos

52 AutodefinidosSpanish-language crossword puzzles

La ficha en español

Spanish only — the clues are written in Spanish, so there is no English edition.