Authors
Brian Hamilton builds Hamilton Digital Media's puzzle systems and websites; Karan Hamilton shapes the puzzle ideas, testing, wording, and player experience. Alongside their puzzle publishing, Brian also develops practical online calculators.
Puzzle creator, software developer, and publisher
Brian Hamilton is a puzzle creator, software developer, and co-founder of Sudoku Online Puzzles. He has an internet engineering degree and 30 years of development experience, including building mathematical software models for sports prediction companies. His work spans puzzle games, solvers, generators, and practical online calculators.
Read Brian's profilePuzzle designer, game tester, and co-founder
Karan Hamilton is a puzzle designer, game tester, and co-founder of Sudoku Online Puzzles. She helps shape puzzle ideas, testing, writing, instructions, and the player experience across the Hamilton Digital Media puzzle network.
Read Karan's profileWhy these pages exist
Every puzzle site, app, and book in the network is made by two people. Knowing who they are makes it easier to judge whether the work is worth your time.
The puzzles are built by someone who has written the solvers and generators behind them, and tested by someone who plays them before anyone else does.
Author credits appear across the network. These profiles are the permanent home for those names, so a byline elsewhere can always be traced back here.
How the work divides
Brian works on the technical half of the network: playable boards, puzzle generators, solvers, hint systems, printable output, responsive layouts, and the code that keeps a puzzle page working properly on whatever device it opens on.
Karan works on the half that decides whether any of that is actually enjoyable: puzzle ideas, difficulty, instructions, wording, testing, and the honest question of whether a new player would understand what to do without being told twice.
Most puzzles in the portfolio pass through both. A puzzle that is technically correct but confusing to play does not ship, and neither does a good idea that the code cannot generate fairly.
Brian's tool making also extends beyond puzzles. His engineering background and experience building mathematical software models inform the company's practical calculator sites, a separate area of work serving people with everyday calculations.
Attribution
Author credits appear on puzzle guides, solving advice, app listings, book pages, and project notes across the network. Where a page carries a byline, it links back to the profile here. Brian's profile also describes his work as the developer of the Toolbox calculator sites.
If you need author details for a review, listing, citation, or app-store submission, our publishing standards page explains how we handle authorship, corrections, and commercial disclosure.