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Sudoku SOS is a web app that uses human solving strategies to solve your Sudoku. It renders a step-by-step list of each action to teach you exactly what to do.

Currently implements the following solving strategies:

• Sole Candidates
• Unique Candidates
• Naked Sets (Naked Pairs, Naked Triples, Naked Quadruples)
• Hidden Sets (Hidden Pairs, Hidden Triples, Hidden Quadruples)

It also features:

• an efficient Sudoku inputting system
• a navigatable list of steps
• multiple example puzzles
• a mobile-friendly user interface