Tick all of the puzzles off in one go with this book, which has word scrambles, Sudoku, word searches and crosswords all in one. Activity book for adults, £12.95, Amazon BUY NOW ...

Solutions below. OCTOBER 18 - 16x16 SUDOKU: There are letters and numbers to contend with on today's super-sized grid. Tell us what you think of this week's puzzles on reader comments below.

SEPTEMBER 7 - SIAMESE SUDOKU: It's two puzzles combined into one for today's ultimate challenge. Solving one grid should help you complete the other. How are you finding our Ultimate Week?

Dr Inkala unleashed his first “ultimate” sudoku in 2006 which experts solved in 24 hours. He has been regularly updating the puzzles making them more difficult each time.

Sophie Merritt only discovered the puzzles two months ago SWNS 11/03/2016 10:57am GMT ...

Kakuro, a math-cum-logic puzzle closer to KenKen than Sudoku, didn’t make quite make the second-wave splash that puzzle-book publishers had hoped for in 2006.

Sudoku’s success in Britain is partly due to fierce newspaper competition, and partly to a deeply ingrained puzzle-solving habit in this nation of Scrabble-lovers and cryptic-crossword addicts.