Where to play

Kakuro, KenKen and Calcudoku — deduction with arithmetic instead of plain Sudoku.

Chess tactics, Go life-and-death, Gomoku, Nine Men's Morris — find the unique solution in the rules, not a match.

Forums, blogs and channels — techniques, handmade grids, and contest talk.

World Puzzle Federation, national championships, and ranked online series.

A short index of escape-room reviews and puzzle-hunt calendars. Open How to play for the formats themselves.

Slitherlink (Loop the Loop), Nurikabe, Hashi (Hashiwokakero, Bridges), Masyu, Yajilin, Heyawake — Nikoli grids in the browser.

A short list: Project Euler and Advent of Code — proof and code more than pencil grids.

Tangram and Rubik's, playable in the browser — physical puzzles with a digital version.

Nonogram, Picross, Hanjie, Griddler: shade from the clues. A picture means the logic held.

Mazes and pattern sequences — a short list for now; more hosts welcome.

One site, lots of genres. The quickest way to try something you haven't played yet.

A short list of free PDF books and sheets — Sudoku and related grids for a bag and a pencil.

Riddles, lateral-thinking puzzles and brain-teasers — best in short bursts. A short list for now.

Step-by-step solvers, editors and generators — for the next move, not a pasted solution.

The familiar number grid: no repeats in any row, column or box.

Killer, jigsaw, X, thermo, arrow and the rest — Sudoku with an extra rule on top.

A short list of spot-the-difference and hidden-object browsers — quick, low-commitment tabs.

Crosswords, cryptics, anagrams, cryptograms — the language is the clue. A little vocabulary goes a long way.

Type pages for knights and knaves, river crossing, balance scales and syllogisms. Dedicated hosts are still sparse — try portals meanwhile.

Browse Classic logic puzzles →