Sudoku Solver
Watch a backtracking algorithm solve Sudoku puzzles step by step. Visualize how the solver tries, backtracks, and finds the solution.
About Sudoku Solver
Pick a Sudoku puzzle and watch a backtracking algorithm work through it cell by cell — filling in a candidate digit, hitting a dead end, erasing, and trying the next possibility. The visualization makes each decision visible in real time, so you can follow exactly why the solver retreats from a branch and how it eventually converges on the solution.
This is genuinely useful for anyone studying computer science education topics like recursion or constraint-based search. Seeing backtracking animate across a grid builds an intuition that pseudocode alone rarely delivers. If you enjoy pairing algorithmic concepts with visual tools, Graphing Calculator offers a similar hands-on way to watch math behave in real time.
Works best on a desktop or laptop where the full grid and step annotations are easy to read at a glance — no account or downloads needed, just open and play.
Look inside
How to use
This tool visualizes how a computer solves Sudoku puzzles using the backtracking algorithm. Watch as it automatically fills in numbers and backtracks when it hits dead ends. • Click cells and type numbers 1-9 to manually enter puzzle clues • Use "Generate Board" to create a random puzzle automatically • Click "Solve" to watch the algorithm solve the puzzle step-by-step • Select solving speed from the Speed dropdown menu (Fast, Medium, Slow) • "Clear" removes all numbers from the grid • The algorithm tries numbers in empty cells, highlights attempts in real-time, and backtracks when it finds conflicts • Fireworks appear when the puzzle is solved • In "Slow" mode, you can see detailed explanations of each solving step • Only valid Sudoku numbers (1-9) are accepted in cells • The grid follows standard Sudoku rules: each row, column, and 3x3 box must contain digits 1-9 exactly once
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