Play Puzzles by Krazydad

Thousands of free sudoku and other logic puzzles.

Solve on your desktop, tablet or phone.

Killer Sudoku

Challenging puzzles that combine Sudoku + Kakuro strategies.

Sudoku

My original collection has tons of interactive Sudoku puzzles.

Kakuro

Also known as Cross Sums, these numeric crossword puzzles tickle the brain.

Split Ends

Don't pull your hair out over these new puzzles! Don't let the shapes line up.

Train Tracks

Help the train get to its destination. Don't get derailed!

Star Battle

Oh my gosh, they're full of stars! A fun object-placement puzzle currently published in The New York Times as Two Not Touch.

Full Sudoku Menu

Printable Puzzles

Printable versions of all these puzzles (and many more).

7 Queens

Star Battle meets Chess. Help the lone queens find their castles!

Suguru

Sometimes called Tectonics or Number Blocks, these puzzles have very simple rules but can be extremely challenging!

Jigsaw Sudoku

Sudoku puzzles with irregular shapes like a jigsaw puzzle.

Binox

An addictive binary puzzle, also known as Binairo, Binoxxo, Tic-Tac-Logic, Takuzo, Bineiro, Brain Snacks, Unruly, Zinero and Zernero.

Troix

Three-way Binox! Also known as Trinox, Threedoku, and Train Snacks.

Vermicelli

Are they worms? Are they spaghetti? Only the vermicelli know for sure. My take on the Simple Loop puzzle.

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Area 51

Protect aliens from mutant cactus in this engaging hybrid of Slitherlink, Masyu, and Cow & Cactus.

Battleships

A solitaire version of the classic strategy game in which you hunt and sink a hidden enemy fleet.

Cow & Cactus

Build a corral to keep your cows from eating the cactus in this path-building treat.

Galaxies

Also known as Tentai Show in Japan, these lovely puzzles are all about symmetry.

Akari

Also known as Light-up, you'll illuminate the world as you place lights in just the right spots.

Bridges

Also known as Hashiwokakero, connect islands to form a network of bridges in this spatial-reasoning puzzle.

Inkies

Mathematical Sudoku-like puzzles.

Masyu

Elegant numberless pathway puzzles with pearlescent clues.

Samurai Sudoku

Conjoined Sudoku grids make for a longer-lasting and most satisfying solving experience.

Futoshiki

Also called Unequal and More-or-Less, Latin squares with inequality signs.

Variety Slitherlink

Beautiful spatial-reasoning puzzles for the discriminating solver.

Slitherlink

Draw meandering loops in this addictive logic puzzle involving spatial reasoning.

Ripple Effect

A variant of Suguru in which the clues create curious cascading effects.

Jigoku

Jigoku means hell in Japanese, and these fiendishly difficult Sudoku puzzles with greater- and less-than signs will show you why.

Community

Come join the Krazydad community at our own Discord Server. Get technical help, suggest new features or just discuss your deepest puzzle thoughts!

All puzzles ©2005-2025 KrazyDad.com. Feel free to reproduce the puzzles for personal, church, school, hospital or institutional use. Please do not use my puzzles in for-profit publications without my permission. If you need free puzzles for your small circulation newspaper, or you would like to purchase puzzles for a book, periodical, app or website, contact me at dad@krazydad.com.

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Discord Community