My original collection has tons of printable Sudoku puzzles.
Three-way Binox! Also known as Trinox, Threedoku, and Train Snacks.
Mathematical Sudoku-like puzzles, also known as Calcudoku.
Oh my gosh, they’re full of stars! A fun object-placement puzzle currently published in The New York Times as Two Not Touch.
Also known as Cross Sums, these numeric crossword puzzles tickle the brain.
Additional puzzles and tutorials for fans of my New York Times puzzles, also known as Star Battle. Available in 1-Star, 2-Star and 3-Star variants.
Play these versions of my most popular puzzles. Best on a tablet or desktop. Smaller puzzles also work on phones. Save some trees!
Puzzles and mazes suitable for kids and novices alike!
Beautiful spatial-reasoning puzzles for the discriminating solver.
Assorted mazes, animal mazes and dinosaur mazes - perfect for bored kids!
Challenging puzzles that combine Sudoku + Kakuro strategies.
Sometimes called Tectonics or Number Blocks, these puzzles have very simple rules but can be extremely challenging.
Star Battle meets Chess. Help the lone queens find their castles!
Help the train get to it's destination. Don't get derailed!
Have you ever tried to solve a puzzle without coffee? Let's keep the caffeine flowing and the puzzles free by donating $10 via Paypal. | Thank you!!
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Don't pull your hair out over these new puzzles! Don't let the shapes line up.
Four new variations on a classic where the sky, and logic, are the only limits.
Draw meandering loops in this addictive logic puzzle involving spatial reasoning.
Conjoined Sudoku grids make for a longer-lasting and most satisfying solving experience.
16 × 16 Sudoku puzzles with hexadecimal digits.
Kid-friendly puzzles with cut-out tiles instead of numbers!
Inky (Calcudoku) puzzles that have been encrypted for an extra hard challenge!
Three new varieties of Sudoku puzzles with greater-than and less-than signs.
The outer three numbers are clued with sums. Five kinds to choose from!
Circle the nine digits 1–9. A new addictive puzzle!
Come join the Krazydad community at our own Discord Server. Get technical help, suggest new features or just discuss your deepest puzzle thoughts!
Sudoku puzzles with irregular shapes like a jigsaw puzzle.
A solitaire version of the classic strategy game, in which you hunt down and sink a hidden fleet.
Also known as Hashiwokakero, connect islands to form a network of bridges in this spatial-reasoning puzzle.
Build a corral to keep your cows from eating the poisonous cactus.
A variant of Suguru in which the clues create curious cascading effects.
Elegant numberless pathway puzzles with pearlescent clues.
Eight more of your favorite puzzles, every day!
Fiendishly difficult comparison Sudoku puzzles with greater-than and less-than signs and no givens.
A personal favorite! Kakuros combined with Cryptograms.
Also known as Tentai Show in Japan, these lovely puzzles are all about symmetry.
Four new varieties that use so-called Sandwich clues. Including my personal favorite: The Dagwood.
Consecutive numbers are clued with little white bars. Three kinds to choose from!
Also called Unequal and More-or-Less. Latin squares with inequality signs.
Protect aliens from mutant cacti in this engaging hybrid of Slitherlink, Masyu, and Cow & Cactus.
An addictive binary puzzle, also known as Binairo, Binoxxo, Tic-Tac-Logic, Takuzo, Bineiro, Brain Snacks, Unruly, Zinero and Zernero.
Mirror mazes full of cute undead, with spine-tingling full-page art made for coloring too! Great for kids and adults alike.
Diagonal Sudoku and four other varieties that add extra constraints to the Sudoku grid.
Numeric crosswords by guest constructor Yochanan Dvir.
Hexagonal Cross-figure puzzles by guest constructor Neil Aggarwal.
Links to daily crossword puzzles and resources.
Star Battle meets Chess. Help the lone queens find their castles!
