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 in 2026. All free, all no-install, all worth a bookmark.

1. Sudoku.com

The cleanest free Sudoku implementation on the web, with smart notes, mistake checking, and four difficulty tiers. No login required for daily play, browser storage handles unfinished puzzles. The daily Sudoku adds variety; expert mode is 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 thousands of free puzzles in sizes from 5×5 to 50×50, 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 40-plus classic logic puzzles ported to the browser by Simon Tatham (yes, the PuTTY author). Includes Slant, Bridges, Loopy, Light Up, Pearl, and many more — most of which originated in Japanese puzzle magazines. 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. Linkdoku

A daily logic puzzle in the Wordle mold — you connect a set of words by figuring out the hidden chain. Quick to play, hard to master. Browser-only, no account, daily reset. If you’ve burned out on Wordle and Connections but want to keep the daily-puzzle habit, Linkdoku fills the slot.

8. Mahjong Solitaire

The tile-matching layout puzzle that’s been on every operating system since the early 1990s. Browser versions are everywhere; the best free implementations (Mahjong.com, Mahjong Time) preserve the original turtle layout and add timer modes. Pure pattern-matching logic dressed as a game.

9. Minesweeper Online

Real Minesweeper, in the browser, with no Microsoft Solitaire Collection wrapper. The classic Beginner/Intermediate/Expert difficulty tiers, accurate to the Windows original, with a competitive leaderboard for the ranked version. Pure probability and deduction. The game that taught a generation of office workers to count.

10. Sokoban (HTML5 Builds)

The block-pushing logic puzzle invented in 1981 by Hiroyuki Imabayashi. Multiple free browser implementations preserve the original puzzles plus thousands of community-designed levels. 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, Linkdoku, and the Sudoku.com daily puzzle are the easiest entries to a daily habit. Each takes under ten minutes, resets at midnight local time, and gives you a clear streak signal. Stack them and you’ve got a 20-minute 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 Linkdoku straddle. Both formats reward patient play.

Frequently asked questions

Are these logic games really free?

Yes. Every game on this list has a fully free tier in the browser without signup. Sudoku.com and Lichess offer premium features (extra puzzles, training tools) but the core puzzles are free forever.

Can I play on a Chromebook?

All ten run on a Chromebook. Simon Tatham’s collection, Nonograms.org, and Minesweeper Online are the lightest. Mahjong and Sokoban builds are slightly heavier but still work 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 and Brainzilla has shareable puzzle results. 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, Lichess Puzzles, Sokoban — feel meaningfully better with a mouse or keyboard. Sudoku.com, Connections, and Linkdoku are mobile-native.

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.