Welcome to the blog of current UKPA sudoku champion, two-time Times national sudoku champion and general logic puzzle fan Tom Collyer.

Home of the original Friday Puzzles, each Friday I publish a 100% original and handmade logic puzzle, inspired by the world-famous Nikoli company.

How to play:
Akari – Fillomino – Hashi – Heyawake – Hitori – Kakuro – LITS – Masyu – Numberlink – Nurikabe – Ripple Effect – Shikaku – Slitherlink – Sudoku – Suraromu – Yajilin.

• Friday Puzzles (144)
• Masyu (31)
• Nurikabe (26)
• Sudoku Variants (21)
• Sudoku (16)
• Heyawake (12)
• Yajilin (11)
• Slitherlink (9)
• Numberlink (5)
• Kakuro (5)
• Akari (4)
• Hitori (3)
• Suraromu (2)
• Hashi (2)
• Ripple Effect (2)
• Shikaku (1)
• Lits (1)

• CrocoPuzzle – [English guide]
• Fed-Sudoku
• nikoli.com
• nikoli Sudoku @ guardian.co.uk
• LogicMasters India
• Sudoku Xtra Magazine
• UK Puzzle Association

• Angela & Otto Janko
• Bram de Laat (Para)
• David Millar’s The Griddle
• Gareth Moore’s Puzzle Mix
• Grant Fikes (mathgrant)
• Nikola Živanović
  
• Palmer Mebane (MellowMelon)
• Rishi Puri (purifire)
• Rohan Rao
• Thomas Snyder (motris)

• I like the appearance of the solution. :P Nice one. by Prasanna Seshadri on this entry
• I think I've seen something vaguely similar in some of Palmer's puzzles as well. To be honest I've a… by on this entry
• That's two puzzles in a row where I find something I had used before. I know, not plagiarism; just g… by Bram on this entry
• Kota, that's not really true. I had made my puzzle before going to the WPC already. Also I don't hav… by Bram on this entry
• About 20 minutes, after restarting from a mistaken conclusion. by Bryce Herdt on this entry