Brain games

304 hand-picked web games, playable right here — no downloads, no accounts, no ads. Most work on a phone; the ones marked Desktop want a keyboard and mouse. Everything older than the touchscreen lives in the Flash archive.

Show: All 304 · Plays on a phone (273) · Needs a keyboard (31)

Brain games:

Bytle Guess the hidden 8-bit binary number, entered in decimal, in six tries.

Capture Go Simplified Go on a 9x9 board - capture any opposing stone group first to win.

Caro Board (Gomoku) Get five in a row before your opponent - play a friend locally or a responsive CPU.

Catculus Drag across adjacent tiles that add up to the target. Black cats keep sitting on the numbers you needed.

CheaterMind A Mastermind variant where the computer never actually commits to a secret code until it has to — an adversarial twist confirmed working cleanly through a tap-native color-picker UI.

Checkers Classic Checkers/Draughts with a clear select-then-move control scheme, a real AI opponent, and local two-player mode.

Chess A clean, fully-featured chess implementation from the LittleJS engine's own author — AI opponent, local pass-and-play, and tap-to-move touch controls confirmed working end to end.

Chrono RobotDesktop Move a small time-travelling robot through 20 puzzle-platformer levels, retrieving a Chrono Crystal for a time machine - confirmed genuinely working via real held-key movement and a real mid-air jump.

Complements A bubble shooter with a twist: gems clear when they touch their complementary color, not an identical one, and holding a shot grows the gem before you fire.

Couch 2048 2048 reimagined as a soft-body physics puzzle. Drag cushions together to merge them.

Counterfeit Monkey Remove one letter and a pear becomes a pea. You are two spies sharing one body, on the run with a letter-remover.

Crayon Contraptions Draw the missing piece of a crayon Rube Goldberg machine, press GO, and watch the whole chain go off.

Daily Puzzle A new small logic puzzle every day, and a different kind of puzzle for each day of the week.

Do Not Make 13 Draw one line across the screen so that nothing on either side adds up to 13. Easy, until the plus signs join in.

Dominoes Tap to select a tile, tap the highlighted end to place it, and try to out-block an AI that actually plans ahead.

Dragonsweeper Minesweeper, except the numbers are monster hit points and clicking one starts a fight. A viral, critically loved twist on a 35-year-old genre.

Drop Four Classic Connect Four against a genuine AI, a friend on the same device, or watch two AIs face off.

Emoji Crush Drag to swap emoji, hit each level's fruit-collection objective before you run out of moves.

Forever Wonder Colour A one-screen Sokoban where time itself is a puzzle piece. Discover the secret of the Wonder Colour to leave the cave.

Four in a Row Drop coloured pieces into a seven-column grid and line up four before your opponent does — offline vs a friend, vs AI, or watch two AIs play.

F FOURFOLD by Mohammed Saud

FreeCell Solitaire A clean, correctly-rules FreeCell built on the same drag-and-drop card foundation as this developer's other card games.

Get sword, kill dragon, save princess A one-room Bitsy puzzle jam game whose title is also its entire plot — except the level keeps repeating, and the real puzzle is figuring out why.

GhostedDesktop A box-pushing puzzle where you have exactly 13 steps before you turn into a ghost, and only ghosts can collect the coins.

Go A real 9x9 Go with capture rules, territory scoring and an AI opponent, built for touch.

Hexahedral Tap an adjacent cube to slide it and reach the goal tile before you run out of moves — 30 levels across three difficulties.

Hexle Guess the hidden 16-bit hex number in six tries, with a daily logic hint to help.

Hextris Tetris folded around a hexagon. Spin the middle to catch falling blocks and match three.

InversionDesktop A twin black/white puzzle-platformer where two characters must move (and invert) together - confirmed genuinely playable via real keyboard input: movement, jumping, and the signature invert mechanic all verified working.

Jewelsback A traditional match-3 puzzle whose drag-to-swap mechanic runs through the identical code for a finger as for a mouse — confirmed by triggering a real match through the exact functions a touch gesture invokes.

Kittens United Guide a mother cat back to her scattered kittens on a move-limited grid, dodging obstacles and grabbing yarn balls along the way — built for js13k's 13-kilobyte competition.

KleptoKitty Swipe the cat through the mansion: find the key, grab the diamonds, get out before dawn and the guards.

Letter Guess Guess the hidden 5-letter word using colour clues after each guess.

MACHINE DISCO Sneak into the robots-only disco in a bad disguise: watch how the robots dance, crack the pattern, then dance like a machine without getting caught.

Match Three Swap adjacent gems to line up 3 or more. Cascades, combos, and a high score chase.

Merlin vs Alfonso A Monument Valley-styled isometric puzzler — drag golden objects with telekinesis and outwit chess-piece enemies moving by real medieval rules.

Mine Sweeper A clean single-file Minesweeper. Easy mode fits a phone screen perfectly; Medium and Hard do not.

MineSweepear Island A Ludum Dare 32 hex-grid twist on Minesweeper — drag a finger across the board to draw a scoring path against a 60-second clock, with spatialised audio hinting at nearby mines.

Mnimi Watch the growing colour sequence, repeat it back correctly, go one round further.

Non-Mewtonian Cat Is it a solid? Is it a liquid? It's a cat. It stretches, it pours, it fits in the gap.

Number Knight Tap the smaller number to kill it, absorb its power, and out-think the elemental twist that turns this fake-ad gimmick into a real puzzle.

Pegball A polished Peggle-style peg-clearing shooter -- aim your cannon, launch the ball, and chase escalating combo multipliers to knock out every orange peg. Confirmed a real physics-driven bounce chain on both touch and mouse.

Picreact A React-built Nonogram/Picross. Tap a cell to cycle it through fill, cross, and clear.

Pixel Puzzle A clean nonogram/picross with three board sizes and a genuinely touch-friendly tap-to-fill, long-press-to-mark-empty control scheme.

PROXX Minesweeper's black-hole reskin — the puzzle hasn't changed since 1990, but a Clear/Flag switch finally makes it work with a thumb.

Push Back Drag across the water to create real fluid currents and steer stranded boats home — a js13k 2019 Mobile category winner built on a genuine physics simulation.

Puzzle Chess Find the best move in real chess positions drawn from a bundled 24,595-puzzle offline database with a working skill rating - confirmed genuinely working via real engine-validated moves, including a found checkmate, on both desktop and phone.

Reversi Classic Reversi/Othello with a clean tap-to-place control scheme, a real AI opponent, and local two-player mode.