10 Best Browser Logic Games (Free, No Download)

Logic games are the genre that proves browsers can host serious puzzle design. You don’t need 3D graphics for a great deduction puzzle — you need clean rules, a tight feedback loop, and a difficulty curve that respects your time. The ten browser logic games below all clear that bar today. All free, all no-install, all worth a bookmark.

1. Sudoku.com

The cleanest free Sudoku implementation on the web, with notes, mistake checking, and several difficulty tiers. No login required, and unfinished puzzles are saved in your browser. Daily puzzles add variety; the top tiers are genuinely hard. Mobile and desktop both excellent.

2. Nonograms.org

Nonograms (also called Picross, Hanjie, Griddlers) are number-clue logic puzzles where you fill in a grid based on row and column counts. Nonograms.org hosts a large free archive of puzzles from small grids to very large ones, plus color variants. Pure deduction, no guessing. The site interface is older but functionally bulletproof.

3. Simon Tatham’s Puzzle Collection

A free collection of about 40 classic logic puzzles by Simon Tatham (yes, the PuTTY author), playable in the browser or as desktop and mobile apps. Includes Slant, Bridges, Loopy, Light Up, Pearl, and many more — many of which originated in Japanese puzzle magazines such as Nikoli’s. Each puzzle has a generator with adjustable difficulty. The interface is utilitarian; the puzzles are world-class.

4. NYT Connections

The category-grouping daily puzzle from the New York Times. Sixteen words, four groups of four, figure out which words go together. The puzzle is free, no NYT subscription required, and the difficulty calibration is among the best in modern daily-puzzle design. Takes five to ten minutes most days; the purple group is always sneaky.

5. Lichess Puzzles

Lichess hosts a free archive of millions of chess tactics puzzles — find the best move, deliver checkmate, escape the fork. The puzzle rating system adapts to your skill, so you stay in the productive zone. Account optional but recommended for progress tracking. The single best free chess training resource on the web.

6. Brainzilla

A generalist logic-puzzle site with grid logic puzzles, Sudoku variants, crossword puzzles, and word games. The grid logic format (the “five houses, who owns the zebra” style) is the standout — Brainzilla has a strong catalog at multiple difficulty levels, all free to play in the browser.

7. Mastermind

The 1970 code-breaking classic: guess a hidden sequence of colored pegs, read the black-and-white feedback, and narrow down the answer. Our Mastermind offers easy, medium, and hard settings (six or eight colors, eight or ten tries) plus an option to allow duplicate colors. Pure deduction in a few minutes per game, and a new random code every time.

8. Mahjong Solitaire

The tile-matching layout puzzle popularized by Activision’s Shanghai in 1986 and later bundled with Windows. You clear matching pairs of free tiles from a stacked layout, and the logic is in choosing which pairs to remove first so you don’t bury the tiles you need. Our Mahjong Solitaire runs free in the browser. Pattern-matching logic dressed as a game.

9. Minesweeper

Real Minesweeper, in the browser, with no Windows wrapper. Our Minesweeper uses the classic Beginner (9×9, 10 mines), Intermediate (16×16, 40 mines), and Expert (30×16, 99 mines) boards from the Windows original. Pure probability and deduction. The game that taught a generation of office workers to count.

10. Sokoban

The box-pushing logic puzzle created in 1981 by Hiroyuki Imabayashi and published by Thinking Rabbit in 1982. Our Sokoban runs free in the browser with undo and restart keys, and the community has designed thousands of levels for the format over the decades. Pure spatial logic — no time pressure, no random elements, just figuring out the right order to push the boxes. Best on desktop with arrow keys.

Which one should you start with?

If you’ve never played a browser logic game, start with Sudoku.com‘s easy daily — the rules are familiar even if you’ve never played seriously. For something completely new, Simon Tatham’s collection includes a dozen formats most people haven’t seen. NYT Connections is the lowest-friction daily.

For deeper, longer sessions, Nonograms.org and Lichess Puzzles have effectively unlimited content at the right difficulty. Sokoban is the genre’s purest expression — pure logic, no luck.

What’s the best for daily habits?

NYT Connections and the Sudoku.com daily puzzle are the easiest entries to a daily habit. Each resets once a day and usually takes a few minutes. Add a quick round of Mastermind or Minesweeper and you’ve got a short logic warmup for the morning commute.

Logic games vs. puzzle games

The line between “logic game” and “puzzle game” is fuzzy, but a useful distinction: logic games rely on pure deduction (Sudoku, Nonograms, Sokoban) and don’t change between sessions; puzzle games often involve discovery or pattern-matching that varies (Wordle, Connections). Most of this list is logic-pure; Connections and Mahjong Solitaire straddle. Both formats reward patient play.

More pure-logic puzzles to try

If Sudoku and nonograms are your favorites, we have a few more deduction puzzles, each with a new daily puzzle and exactly one solution every time. Logic grid puzzles are classic zebra-style puzzles where clues tell you who owns which pet or drinks which drink. Slitherlink asks you to draw one closed loop that matches the numbered cells, and Nurikabe has you shade a connected sea around numbered islands. For a math twist, Calcudoku fills a Latin square so each cage hits its target with addition, subtraction, multiplication or division.

Logic puzzles with a story

Two of our newer games wrap pure deduction in a theme. Our Camping Game has 40 Tents and Trees puzzles plus a new daily puzzle: every tree needs exactly one tent directly beside it, tents never touch each other, not even diagonally, and the numbers on each row and column say how many tents go there. Our Spy Game mixes cipher cracking with mole-hunt logic grids in the same spirit as zebra-style puzzles, across 24 missions with three-tier hints.

Frequently asked questions

Are these logic games really free?

Yes. Every game on this list can be played free in the browser without signup. Sudoku.com offers optional paid extras; Lichess is entirely free and funded by donations.

Can I play on a Chromebook?

All ten run on a Chromebook. Simon Tatham’s collection, Nonograms.org, and our Minesweeper are among the lightest. Our Mastermind, Mahjong Solitaire, and Sokoban are also lightweight and run on entry-level hardware.

Which is best for serious puzzle training?

Simon Tatham’s Puzzle Collection for variety; Sudoku.com for one format mastered deeply; Lichess for chess tactics specifically. All three reward sustained practice with measurable improvement.

Are there multiplayer logic games?

Logic puzzles are mostly single-player by nature, but Lichess supports real-time chess against other people. For pure cooperative logic, Keep Talking and Nobody Explodes (paid) is the standout — no free browser equivalent matches it.

Do these work on mobile?

Most work on mobile but some — Simon Tatham’s collection, Mahjong Solitaire, and Expert-level Minesweeper — feel meaningfully better with a mouse or keyboard. Sudoku.com and Connections are comfortable on a phone, and our Sokoban supports swipe controls.

The takeaway

Browser logic games are one of the genres where free options compete with paid apps and often win. Bookmark two or three for daily habit, save Simon Tatham’s collection for deep dives, and rotate Sokoban or Nonograms when you want a new format. For a reaction-time game that’s the opposite of slow logic, the Chrome Dino game is one tab away — pure reflex instead of pure deduction.

Related: 10 Best Browser Typing Games (Free, No Download) · 10 Best Browser Tank Games (Free, No Download) · 10 Best Browser Games on Mac (No Download)