Sudoku Solver
A free sudoku game — play it in your browser, no install. Fast backtracking Sudoku solver in Java with an interactive web visualizer — my first ever repo, revisited.
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Open the live demo Source on GitHubFrom the README
A fast Sudoku solver in Java, with an interactive web version that animates the algorithm step by step.
▶ Try it in your browser
This was my first GitHub repo, a backtracking solver I wrote in 2023 while learning to code in college. I came back to it in 2026 to see how much I'd grown: I made it faster, added input validation and tests, set up CI, and built a web visualizer. The original code is kept in original/ for comparison.
The solver uses backtracking: place a digit that fits, move to the next cell, and when you get stuck, undo the last choice and try the next digit.
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