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Logic puzzles

Sudoku, Nonogram, Kakuro and other grid puzzles, sliding and moving puzzles, classic brain teasers and reasoning tests. All free, all in your browser with nothing to download, and each ends with a plain result: a time, a score or a number of moves.

Sudoku and other grid puzzles

Fill the grid by the rules. Each puzzle has exactly one answer, checked before it reaches you.

  • Sudoku

    Fill the grid so every row, column and box has 1 to 9.~5-20 min

  • Queens

    One crown in every row, column and coloured region.~2-8 min

  • Nonogram

    Shade the grid by its numbers to reveal a picture.~2-8 min

  • Kakuro

    Fill the grid so every run adds up to its clue.~3-8 min

  • Calcudoku

    Fill the grid so every cage makes its target.~3-8 min

  • Futoshiki

    Fill the grid so every sign between squares holds.~3-10 min

  • Skyscrapers

    Place buildings so each clue sees the right number.~2-6 min

  • Binary Puzzle

    Fill the grid with 0s and 1s by three simple rules.~2-6 min

  • Star Battle

    One star per row, column and region, none touching.~3-8 min

  • Hitori

    Shade repeated numbers until no line repeats.~3-8 min

  • Slitherlink

    Draw one loop that meets every number.~3-10 min

  • Nurikabe

    Shade the sea around islands of the right size.~3-10 min

  • Bridges

    Join the islands so each has as many bridges as its number.~3-6 min

  • Number Link

    Join each pair of numbers and fill the grid.~2-6 min

  • Number Path

    Join 1 to the last number through touching squares.~2-6 min

  • Domino Puzzle

    Lay the dominoes so every region keeps its rule.~3-8 min

  • Logic Grid

    Work out who has what from the clues.~3-6 min

Sliding and moving puzzles

Slide, push, turn, jump or switch your way to the goal. Several compare your moves with the fewest possible.

  • Tower of Hanoi

    Move every disk in the fewest moves.~1-5 min

  • Sliding Puzzle

    Slide the tiles back into order.~2-5 min

  • Traffic Jam

    Slide the cars to free the red one.~2-6 min

  • Box Pushing

    Push every box onto a target.~2-10 min

  • Pipes

    Turn the tiles until every pipe joins up.~2-6 min

  • Lights Out

    Turn off every light. Each press flips its neighbors.~1-3 min

  • Peg Solitaire

    Jump pegs until only one is left.~3-6 min

  • Chinese Rings

    Take every ring off the bar.~2-5 min

  • Knight's Tour

    Land a knight on every square exactly once.~2-6 min

  • Maze

    Find the way out of a new maze every game.~1-3 min

  • Tangram

    Fill a shape with all seven classic pieces.~3-10 min

Classic brain teasers

Riddles with a trick to find: get everyone across, measure an exact amount, move one match.

  • River Crossing

    Get everyone across the river safely.~2-5 min

  • Bridge and Torch

    Get everyone across the bridge in 17 minutes.~2-4 min

  • Water Jug

    Measure an exact amount with unmarked jugs.~1-4 min

  • Matchstick

    Move one match to fix the equation.~2-4 min

  • One Line

    Draw every line once, without lifting.~2-4 min

Number and math puzzles

Reach a target, balance an equation, fill a square or race the clock.

  • Make 24

    Use all four numbers to make 24.~2-4 min

  • Mental Math

    Solve as many sums as you can in a minute.~1 min

  • Cross Math

    Place 1 to 9 so six equations come out right.~2-5 min

  • Equation Guess

    Find the hidden eight-character equation in six tries.~3 min

  • Shape Equations

    Each shape is a number. Work them out.~2-4 min

  • Magic Square

    Make every row, column and diagonal add up the same.~1-5 min

Reasoning tests

Patterns, sequences, syllogisms and machines: the question types aptitude tests use.

Logic games

Games where thinking ahead beats luck. No Minesweeper board here needs a guess.

  • Minesweeper

    Clear the board without setting off a mine.~2-10 min

  • 2048

    Slide and join tiles to make 2048.~5-15 min

  • Chess Puzzles

    Find the best move in five real positions.~3-5 min

  • Code Breaker

    Crack the hidden four-colour code.~2-5 min

  • Pattern Trio

    Find three cards that match or all differ.~2 min

Which logic puzzle should you start with?

One you already know. Sudoku has four levels, so you can begin on Easy. For something new without numbers, try Queens or Star Battle, where you place crowns or stars by a few simple rules. For a quick round, Mental Math lasts 60 seconds; for a longer think, the Logic Grid Puzzle or Chess Puzzles.

The moving puzzles add a second goal. Pipes, Box Pushing, Traffic Jam and the Tower of Hanoi measure your moves against the proven fewest, so a solved puzzle can still be solved better.

Do you need to be good at math?

For most of these, no. Sudoku uses the numbers 1 to 9 only as labels: nothing is added up, and any nine symbols would work the same way. Queens, Star Battle, Slitherlink and the sliding and moving puzzles need no arithmetic at all. Kakuro, Calcudoku and the number puzzles in their own group above are the ones built on arithmetic.

Which of these puzzles come from Japan?

Many of the grid puzzles were made or named by Nikoli, a Japanese puzzle publisher: Hitori, Nurikabe, Slitherlink, Bridges (Hashiwokakero) and Number Link (Numberlink). Sudoku itself is American: Dell Magazines printed it as Number Place in 1979, and the name Sudoku is Nikoli's, from 1984.

Nonograms began in Japan in 1987, with Non Ishida's pictures made of lit and unlit windows. Kakuro's name is Japanese for “addition cross”, Futoshiki means “inequality”, and the puzzle sold as KenKen, called Calcudoku here, was invented in 2004 by a Japanese maths teacher, Tetsuya Miyamoto.

Are these logic puzzles free?

Yes. Every puzzle on this page is free and runs in your web browser. There's no account to make and nothing to download: open one and start.