Brain & Puzzle
Logic, memory and problem-solving challenges you can play free in your browser — nothing to install.
Zerdly Circuit
Rotate the wires to power the board.
Sudoku
Free online sudoku puzzles.
Memory Test
How long a sequence can you recall?
Minesweeper
The classic mine-clearing puzzle.
Jigsaw Puzzles
Assemble interlocking jigsaw pieces.
2048
Slide and merge tiles to 2048.
Chess
Play chess against the computer at six levels, or two players on one device. Analysis board included.
Four in a Row
Line up four before the computer does. Six opponent strengths, two players on one device, a new position every day and thirty-six tactical puzzles.
Reversi
Trap a line of discs and turn them over. Six opponent strengths, legal-move hints, two players on one device, an analysis board and solved endgame puzzles.
Nonogram
Picture logic puzzles from 5×5 to 25×25, plus a daily. Every puzzle has exactly one solution.
Letter Grid Hunt
Trace words through touching letters and take as much of the grid as you can. A square cannot be reused but a letter can, rare letters are worth more, and every word you missed is revealed at the end.
Word Ladder
Turn one word into another one letter at a time, with every step a real word. Every pair is checked to be reachable before you see it, and par is a measured shortest route rather than an estimate.
Cryptogram
Decode a substitution cipher in a clean letter-mapping workspace. Every passage was written for Zerdly rather than quoted, no letter ever stands for itself, and Strict Mapping changes the rule instead of the size.
Letter Hive
Build words from seven letters, always using the core in the middle. Letters repeat as often as you like, every hive holds at least one word using all seven, and the scoring was counted from the dictionary rather than chosen.
Category Sprint
One letter, several categories, one answer each against the clock. Some categories are checked against a real list and the open ones are on your honour — and the game always says which is which.
Trivia Arena
One question at a time, four answers, and an explanation for every one. Every question shows where its fact came from, and the wrong answers are provably wrong.
Word Chain
Every word starts with the last letter of the one before it. Keep the chain going alone, against the clock, or against an opponent that answers back.
Mental Math Trainer
Timed arithmetic practice across five levels, with worked solutions, a virtual abacus and printable worksheets.
Nine Men's Morris
Line up three and take a piece. Six opponent strengths, move hints, two players on one device, and endgame puzzles with exactly one winning move.
Mancala
Sow the stones, land in your store and go again. Kalah rules with captures and extra turns, six opponent strengths, two board sizes and two players on one device.
Gomoku
Five in a row on a 15×15 or 19×19 board. Freestyle or exactly-five rules, six opponent strengths, two players on one device and a daily puzzle with one winning move.
Dominoes
Match a tile to an open end and lay it down. Draw and Block rules, two to four players, four opponent strengths and a match played to a target.
Go
Serious browser Go. 9×9 and 13×13 against a Monte Carlo opponent, 19×19 for two players, Capture Go for a first game, and full area scoring with dead-stone marking.
Yacht Dice
Roll five dice up to three times, keep what you like, then place the hand on the card. Twelve categories, a daily challenge and a coach that shows exact expected values.
Six-Dice Risk
Roll six dice, set aside what scores, then bank or risk the lot. An original rarity-priced score table, three very different opponents and exact bust odds.
Codebreaker
Deduce a hidden code from exact-position and wrong-position feedback. Five puzzles, a daily code, pencil-mark notes and a solver that shows its reasoning without showing the answer.
Zerdly Memory Cards
Turn two cards over and remember where they were. Five boards up to eight by eight, an untimed Zen board, a ninety-second sprint, a daily layout and two players on one device.
Backgammon
Full-rule backgammon with the doubling cube, match play to eleven points, pass-and-play and four opponent strengths. A daily game everyone plays with the same dice.
Texas Hold'em Poker
Full-rule Hold'em for two to six seats with play chips only. Side pots, three opponent strengths, a Hand Lab that explains every hand, and a daily table everyone gets the same cards on.
Dou Dizhu
Fight the Landlord for three players. Bid for the landlord's seat, take the kitty and play alone against two opponents who cooperate without ever seeing each other's cards.
Gin Rummy
Two-player Gin Rummy with your melds found and grouped for you, your deadwood counted exactly, knocking guidance and three opponent strengths.
Hearts
Four-player Hearts with pass rounds, shoot-the-moon handling and opponents that remember who has run out of what. Every heart costs a point, the queen costs thirteen, and the lowest score wins.
Spades
Partnership Spades with bidding, nil, bags and the penalty that catches everybody. Take exactly what you bid — falling short costs the lot, and going over is nearly free until it suddenly costs a hundred.
Euchre
Fast 24-card Euchre with bowers, trump calling, loner hands and strong local AI. The jack of the same colour joins the trump suit — and it beats the ace.
Cribbage
Full two-player Cribbage with a pegging board and automatic itemised scoring. Every hand is counted out for you — fifteen two, fifteen four, and a pair is six — with the cards that made each item lit up.
Crazy Eights
The family shedding game played properly — wild eights, two draw rules and two to four at the table. Empty your hand first and you score whatever everybody else is still holding, and an eight is worth fifty.
President
The fast climbing game — singles, pairs, triples and quads, three to five at the table, and roles that carry into the next round. A three is the worst card in the pack and a two is the best.
Go Fish
The first card game most people learn, with the part nobody is taught: every ask is public, and the memory panel keeps what each one gave away. Two to four players, a fast pairs preset and a daily deal.
Ludo
The cross-and-circle race, two to four players, with captures, a quick two-token variant and pass-and-play at one device. An opponent d squares behind takes you on a roll of d — and the board can mark the ones in reach.
Kakuro
Cross sums on boards from 7×7 to 13×13, with a daily. Every puzzle has exactly one solution and is solvable by reasoning — the hint says which deduction, and never guesses.
Arithmetic Cages
Fill a Latin square so every outlined cage hits its arithmetic target. Boards 4×4 to 6×6, a no-operator challenge and a daily — every puzzle has exactly one solution.
Slitherlink
Draw one closed loop along the dots, where each number says exactly how many of that square’s sides the loop uses. 5×5 to 10×10, a no-mistake challenge and a daily — every puzzle has exactly one solution.
Bridges
Join the numbered islands with one or two straight bridges until every number is exactly right and the whole thing is one connected network. 7×7 to 13×13, assisted practice and a daily — every puzzle has exactly one solution.
Box Push
Push crates through compact warehouse puzzles where planning matters more than speed. A 60-level campaign, a move-par challenge and a daily warehouse — every level proved solvable before you see it.
Traffic Escape
Slide tightly packed vehicles along their own axes to clear a path for the target vehicle. Three difficulty presets, an optimal-move challenge and a daily jam — every yard generated here, with its shortest solution worked out exactly.
Path Pairs
Join each pair of matching letters with a path that never crosses, until every square is covered. Three sizes, a relaxed preset and a daily puzzle — every board generated here, and every one proved to have exactly one solution.
Block Fit
Place three offered block shapes at a time, clearing full rows and columns for a clean endless score chase. Four presets and a daily piece stream — and the pieces are decided before you play, so nothing watches the board.
Number Link
Connect identical numbered endpoints through a clean grid without intersections. Three sizes, a minimal-clue challenge and a daily puzzle — every board generated here and proved to have exactly one solution.
Tangram Studio
Fit the seven classic tans into an outline. Seventy-two shapes generated here, five modes including a daily shape and a free workspace, and completion judged by geometry rather than by matching one stored answer.
Logic Grid Mysteries
Work out who was where, and with what, by combining clues across categories on a marking grid. Three sizes, a guided tutorial and a daily mystery — every puzzle generated here and proved to have exactly one answer.
Maze Labyrinth
Find your way out of mazes carved the moment you ask for them. Five modes including a large maze where one press runs you to the next junction, a loop-free perfect maze, and a fog you have to remember your way through.
Tile Slide
Slide the tiles back into order. Three board sizes, generated artwork where every tile carries its own shape, a daily picture everyone gets the same of, and the option to cut up a photo of your own that never leaves your device.
Colour Sort
Pour layered liquids between tubes until every tube holds one colour. A pour always moves the whole run at the top, never an amount you pick — which is the rule the puzzle is built on. Every board is solved by the computer before it reaches you.
Ball Sort
Sort stacked patterned balls into uniform tubes. Classic moves one ball at a time; the Run move preset takes the whole matching run, which makes it a different puzzle rather than a harder one. Every board is solved by the computer before it reaches you.
Precision Maze
Trace a narrow corridor end to end without touching the sides. Thirty courses in three families, three corridor widths from finger-friendly to unforgiving, a daily course and a full keyboard mode.
Reflex Grid
React to the right cell while decoys sit beside it and the rule keeps changing. Five rule variants including go/no-go and a colour-rule switch, a grid that adapts to how you are playing, and a lifetime reaction-time distribution rather than a single number.
Match-3 Adventure
Swap, clear a line of three and watch the board fall into itself. Charges, cargo to deliver and a twenty-four level campaign whose every move budget was found by playing the level rather than guessing.
Puzzle and brain games
This is the home of Zerdly's logic and thinking games: number puzzles like Sudoku and 2048, the deduction of Minesweeper, the relaxed visual challenge of Jigsaw, memory tests, and Zerdly Circuit's endless power-the-board puzzles. Every one runs entirely in your browser, with progress saved on your own device.