S.P.A.R.K. Edition — Logic Puzzles

sudoku grid Sudoku Saga

Play • Create • Solve • Learn

Choose your path

Play Sudoku Sample Games

Load a sample puzzle and solve it yourself. Conflict detection highlights wrong entries in red as you go. Choose from easy games to five-star classics.

Start playing

AI Puzzle Generator

Watch the AI build a valid puzzle from scratch using randomized recursive backtracking. Choose Easy, Medium, or Difficult — then save and play your creation.

Generate a puzzle

AI Solver

Load a sample puzzle and watch the AI reason through it step by step — applying Naked Singles, Hidden Singles, and backtracking with color-coded annotations.

Watch the AI solve

Rules & Strategies

New to Sudoku? Learn the rules, read the board states, and master solving strategies from scanning and cross-hatching to Naked Pairs and Box–Line Reduction.

Learn strategies

Custom puzzle options

Play Custom Puzzle

Load your last generated puzzle and solve it yourself

Solve Custom Puzzle

Watch the AI solve your generated puzzle with full strategy log

S.P.A.R.K. Chat Log

Read the AI-assisted development dialog behind this app