Puzzle book
Five levels of difficulty, from easy to impossible
The same game, multiplied: sixteen symbols instead of nine — the numbers 1 to 9 and the letters A to G — in grids of 256 squares.
It closes with a flower sudoku: five 16×16 grids interlocked into a single figure of 1,024 squares.
Fill the 16×16 grid with the sixteen symbols — 1 to 9 and A to G — so that no row, column or 4×4 box repeats one.
Paperback, 8.5 × 11 inches, white paper and big grids. The answers are at the back, at no extra cost. Every puzzle goes through a program that looks for a second solution before it is printed: if it finds one, the puzzle is thrown away.
There is a new Catku every day on this site, free and with no sign-up, and a sudoku, a killer, a kakuro, a 16×16 and a nonogram to play or print.
Play today's
