Free Online Puzzles Tools
Check and create Sudoku, word searches, magic squares, nonograms and logic puzzles with local online puzzle tools.
Choose the right tool
Choose a checker to validate a supplied grid and a solver to search for answers. Generators use reproducible seeds. Read uniqueness, unplaced-word and truncation flags before treating an output as complete.
Available tools
- Sudoku Grid Checker
Online sudoku grid checker. A conflict-free incomplete grid is not necessarily solvable.
- Sudoku Solver and Uniqueness Check
Online sudoku solver and uniqueness check. A node-limit result reports unknown uniqueness rather than asserting a unique solution.
- Seeded Sudoku Puzzle Generator
Online seeded sudoku puzzle generator. 22–81 requested clues. Search limits can leave more clues than requested; the achieved count is reported.
- Odd Order Magic Square Generator
Online odd order magic square generator. Odd orders 3–31; every integer from one to n² appears once.
- Normal Magic Square Checker
Online normal magic square checker. Checks normal magic squares using the integers one through n².
- Seeded Latin Square Generator
Online seeded latin square generator. Cyclic-derived Latin squares only, not uniform sampling of every possible Latin square.
- Latin Square Checker
Online latin square checker. No diagonal or Sudoku sub-block constraints are applied.
- N Queens First Solution Finder
Online n queens first solution finder. Reports the first solution only, not the number of all solutions.
- Word Search Grid Finder
Online word search grid finder. Alphabetic rectangular grids; output capped at 5000 matches.
- Seeded Word Search Generator
Online seeded word search generator. Reports words that could not be placed. Filler letters can create extra accidental occurrences.
- Number Pyramid Builder
Online number pyramid builder. Builds a complete pyramid from the supplied base; does not infer missing entries.
- Local Dictionary Word Ladder Solver
Online local dictionary word ladder solver. No online dictionary is fetched; start and end are included as candidate words.
- Hangman Candidate Word Filter
Online hangman candidate word filter. Only supplied candidates are considered; no language dictionary is bundled.
- Mastermind Guess Feedback Calculator
Online mastermind guess feedback calculator. Case-sensitive uppercase letters and digits; repeated symbols are supported.
- Mastermind Candidate Code Filter
Online mastermind candidate code filter. Does not enumerate a complete alphabet automatically; only the supplied candidate list is filtered.
- Sliding Tile Puzzle Solvability Checker
Online sliding tile puzzle solvability checker. Goal ordering is ascending row-major with blank zero in the bottom-right corner; this does not find a move sequence.
- Nonogram Row Pattern Generator
Online nonogram row pattern generator. At most 5000 patterns and 100000 search states; a truncated list is explicitly flagged.
- Minesweeper Neighbor Clue Builder
Online minesweeper neighbor clue builder. Uses # for mines and . for empty cells; does not infer hidden mine positions.
- Grid Maze Shortest Path Finder
Online grid maze shortest path finder. No diagonal moves, weights, doors or keys.
- Cryptogram Word Pattern Matcher
Online cryptogram word pattern matcher. One word at a time; does not solve an entire substitution cipher.