Puzzles by Alastair Chisholm

Indigo Puzzles provides Sudoku, Kakuro, Hashi, Hitori and other puzzles for syndication and we can produce packs for your organisation.

We create high quality puzzles, guaranteed uniquely solvable and never requiring guesswork. We can adjust the difficulty levels to suit, and we concentrate on creating puzzles that feel satisfying to solve, that lead players on a trail and show them new ideas and techniques along the way. And as well as traditional puzzles, we have our very own brand new puzzle - Labyrinth!

Puzzles for Publication


The most popular logic puzzle of all time. We can provide Sudokus at all difficulties to suit. We can also provide kids' puzzles at 4x4 and 6x6, with carefully graded difficulties to suit younger puzzlers; or if 9x9 is too easy, why not try our fiendish 15x15 Monster Sudoku puzzles!


The most popular puzzle in Japan isn't Sudoku – it's Kakuro. Kakuro puzzles are a good shape for publication, and we can provide different sizes to match. And being maths based, they're ideal for kids' puzzles - we can even make them in different shapes!


The game of building bridges. Hashi's full name is Hashiwokakero. It means "Let's build bridges!" and that's exactly what you have to do. It's a wonderfully engrossing game; you can scribble over an easy one in a couple of minutes, or lose an hour staring at a harder challenge until your eyes water. It's a great mix of logic, spatial awareness and even instinct - so long as you never entirely trust that gut feeling!


Hitori is a great new scribbling puzzle. Like Sudoku, it's easy to learn the rules but deviously tricky, and it's just as addictive. Best of all, it's name actually means "Let me alone", so when people interrupt you while you're trying to solve one and ask what you're doing, you can shout "Hitori! Hitori!" and no one will know what you mean (though they may well go away).


Nurikabe (also called Islands in the Stream) is an excellent spatial logic puzzle puzzle. Its rules are slightly more complex than others but they're very intuitive and the puzzles are great fun to play. Suitable for puzzle books and compendiums.


Slitherlink is a puzzle that's simple to understand and fiendish to play. It seems straightforward but beware – at the higher levels there's some serious math theory going on!

Find out more

For more information, you can download our fact sheet - or why not get in touch?

Labyrinth - a brand new puzzle!

Labyrinth puzzle

Labyrinth is a brand new logic from Alastair Chisholm and Indigo Puzzles. Combining a logical and spatial challenge, Labyrinth is a unique puzzle that is easy to understand and satisfying to solve, with a design that is ideally suited for magazine or newspaper publication and a 'feel' that works particularly well for pen and paper puzzle solvers.

If you are looking for a new challenge for your publication or website then Labyrinth is ideal. We've created this factsheet to tell you a little more about it, and about why we like it, and why we hope that you will too – and if you do, we'd love to hear from you!

Download our Labyrinth factsheet    Get in touch