How a Grandmaster Sudoku Race Actually Works
Six players, one grid, no puzzle data sent over the network. Here's the trick.
Blog
Blog
Notes on building Grandmaster Sudoku, and puzzle strategy along the way.
Under the hood
Strategy
Killer Cages, Explained: The Sudoku Variant That's Secretly Just Algebra
No starting numbers, just cage sums. Here's how to read one without wanting to throw your phone.
Behind the scenes
Designing a Sudoku a Grandmaster Wouldn't Be Bored By
Why one very hard grid wasn't the goal — six different ways to be hard was.