Puzzle book
Five levels of difficulty, from easy to impossible
The sudoku you know, now with sums. The grid is split into cages, and each cage says in its corner what the numbers inside have to add up to — with no digit repeating inside a cage.
It ends with a samurai: five grids overlapping at the corners.
The rules of sudoku, plus the cages: the numbers in each cage must add up to the sum in its corner, and none of them repeats inside that cage.
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
