Puzzles
Pick a puzzle and a difficulty. Every attempt is timed and recorded against the profile you are playing as, and every board has a link you can send to someone else.
Number grids
Place digits so every row, column, or region agrees.
Sudoku
4 difficultiesFill the grid so every row, column, and box holds 1 to 9 once.
New board
Binairo
4 difficultiesFill the grid with 0s and 1s under three rules about lines.
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Futoshiki
3 difficultiesA 5×5 Latin square, steered by greater-than signs.
New board
Killer Sudoku
4 difficultiesSudoku with no clues at all — only cages, and what they add to.
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Skyscrapers
3 difficultiesA 5×5 of towers, placed by what each side can see.
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Shading & counting
Decide which squares are in and which are out.
Nonogram
4 difficultiesFill the squares the numbers describe, and a picture appears.
New board
Minesweeper
4 difficultiesClear every safe square. No board ever needs a guess.
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Hitori
4 difficultiesShade out the repeats until every row and column reads clean.
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Akari
3 difficultiesPlace lamps until every square of the board is lit.
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Tents & Trees
4 difficultiesPitch one tent by every tree, and never two side by side.
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Loops & paths
Draw a route that satisfies every clue it passes.
Slitherlink
3 difficultiesDraw one closed loop that satisfies every number it passes.
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Masyu
3 difficultiesDraw one closed loop that obeys every circle it runs through.
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Regions
Cut the board into the pieces the clues describe.
Shikaku
3 difficultiesCut the grid into rectangles, one for each number.
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Star Battle
3 difficultiesPlace the stars so every row, column and region holds exactly one.
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Toggle & state
Press the board into the state you want.
Lights Out
4 difficultiesSwitch every light off. Each press flips its neighbours too.
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Text deduction
No grid — read the clues and name the answer.
Cryptarithm
4 difficultiesEvery letter stands for a digit. Make the sum add up.
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Knights & Knaves
3 difficultiesEvery islander tells only the truth or only lies. Work out which.
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Zebra
3 difficultiesA row of seats, a handful of clues: work out who is where.
New board