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Cover of 2000 Hard to Extreme Sudoku Puzzles for Adults

2000 Sudoku

2,000 puzzles per book. Years of solving.

2,000 puzzles per book · 8.5 x 11 in

At one puzzle a day, a single book lasts more than five years. Classic 9x9 Sudoku graded in order, with every solution printed in the back. The grids are compact (12 per page); for big grids, see our Large Print Sudoku.

Cover of Hard Core Hashiwokakero 200 Puzzles for Adults

Hard Core Hashiwokakero 200

200 tough Hashi puzzles, up to giant 30x30 grids.

200 puzzles · 8.5 x 11 in

Connect the islands, never cross a bridge. Simple rules, deeply satisfying solves and no maths needed. Grids grow from 12x12 to 30x30 as you go, with the rules at the front and every solution in the back.

Cover of Hard Core 16x16 Sudoku 200 Tough Puzzles for Adults

Hard Core 16x16 Sudoku 200

Mastered 9x9? Step up to 16x16.

200 puzzles · 8.5 x 11 in

200 Mega Sudoku using the numbers 1 to 16, with 256 squares to fill and no easy puzzles at all: 100 Hard and 100 Very Hard. Two puzzles per page, rules at the front and solutions in the back.

Cover of 600 Hard to Extreme Calcudoku Puzzles for Adults

600 Calcudoku

Full 9x9 maths puzzles, at the level that suits you.

600 puzzles per book · 8.5 x 11 in

Calcudoku, also called Mathdoku, blends Sudoku logic with + − × ÷. Each book packs 600 full-size 9x9 puzzles across three rising levels: a real step up from the small 4x4 and 6x6 grids in newspapers.

Cover of 1000+ Hard to Extreme Killer Sudoku Puzzle Variants for Adults

1000+ Killer Sudoku Variants

Six kinds of Killer Sudoku, 1,000+ puzzles.

1,000+ puzzles per book · 8.5 x 11 in

Killer Sudoku on 8x8, 9x9, 10x10 and 12x12 grids, plus Killer X and Killer Windoku. Every cage must add up to its total with no repeats: arithmetic and logic together, with variety to last for months.

Cover of 240 Easy Multi Sudoku Puzzles in 12 Variants

240 Multi Sudoku in 12 Variants

12 kinds of merged Sudoku in every book.

240 puzzles per book · 8.5 x 11 in

Samurai, Sohei, Butterfly, Flower and more: overlapping grids that make you think across the whole puzzle. Pick a single level from Easy to Extreme, or the Easy to Extreme book for a mix.