Free Online Brain Games

Balance Scale

Split weighted blocks between two pans so both sides weigh exactly the same. Every block must be used exactly once — the goal is splitting them into two groups whose weights add up to the exact same total.

Digit Drop

Clear adjacent number blocks that sum to the target value, with cells falling to fill gaps. Blocks keep falling to refill the grid, so the challenge is spotting valid target-sum pairs quickly and keeps changing as the board settles.

Equation Scramble

Arrange number and operator tiles into an equation that hits the target value. All the tiles you need are given — the challenge is finding the one arrangement of numbers and operators that actually reaches the target.

Grid Sums

Fill a small grid with digits 1-9 so every row and column matches its sum clue. A compact numeric logic puzzle — every digit you place has to satisfy both its row's sum clue and its column's sum clue at once.

Number Chain

Connect every cell in the grid in strict numeric order using the given clue numbers. The clue numbers anchor the path — the goal is connecting every cell in one unbroken line running strictly from the lowest number to the highest.

Prime Hunt

Tap every prime number in the grid while avoiding composite numbers. Sharpen basic number sense — the grid mixes primes and composites together, and speed and accuracy both count.

Target 24

Combine four numbers with +, −, ×, ÷ to reach exactly 24. There's always at least one way to reach 24 with the given numbers — the challenge is spotting the right order of operations.

Card Match

Flip two cards at a time to find all the matching symbol pairs. A classic memory-matching game — remember where each symbol was flipped so you can pair them up in as few tries as possible.

Chrono Recall

Watch a sequence of colors flash, then tap them back in reverse order. Classic Simon-style memory game — the sequence gets one color longer each round, so recall has to stay sharp as it grows.

Flash Difference

Spot the cells that differ between two color grids before time runs out. Tests fast visual comparison — the two grids look almost identical, and the goal is spotting every cell that's actually a different color before time runs out.

Grid Tracker

Track the highlighted dots as they scramble and bounce around the container. A classic 'multiple object tracking' focus test — the dots become indistinguishable once they start moving, so the goal is following the right ones purely by motion.

Missing Symbol

Memorize 8 flashed shapes, then identify which one was removed. Tests quick visual memory — you only get a brief look at all 8 shapes before one disappears and you have to recall which one it was.

Pattern Memory Blitz

Memorize a flashed tile pattern, then tap the same tiles from memory. Short-term visual memory is the whole game — the tile pattern is only shown briefly before you have to recall it from memory alone.

Einstein's Logic Grid

Deduce each person's pet and drink from a set of logical clues. A classic grid-deduction puzzle in the style of the 'Einstein riddle' — every clue narrows the possibilities until only one full assignment satisfies them all.

Mastercode

Deduce a hidden 4-digit code using exact and partial match feedback. Think Mastermind: each guess narrows down the hidden code, so use the feedback strategically rather than guessing blindly.

Minesweeper Tactics

Reveal every safe cell using the adjacent-mine-count numbers, without triggering a mine. The classic logic-deduction game — every revealed number is a hard constraint on its neighboring cells, and the goal is using those constraints to clear the whole board without ever guessing into a mine.

Nonogram

Fill grid cells to reveal a hidden pixel-art picture, guided by row and column clues. A classic picture-logic puzzle (aka Picross) — the row and column clues fully determine the picture, so every cell can be deduced rather than guessed.

Path Finder

Navigate from start to end through a grid of hazards and forced-direction arrow tiles. The arrow tiles remove your choice on the next move, so the goal is planning a route to the end that accounts for every forced turn along the way.

Sudoku

Fill the 9x9 grid so every row, column and 3x3 box contains 1-9 exactly once. Classic logic-only Sudoku — no guessing required, every cell can be deduced from the numbers already on the board.

Truth & Lie Island

Deduce which characters are truth-telling Knights and lying Knaves. A classic knights-and-knaves logic puzzle — work out which statements can only be true if their speaker is a knight, and which only make sense from a knave.

Block Fit

Place polyomino pieces onto a grid until every cell is covered exactly once. Every piece has a place — the goal is finding the exact arrangement that leaves no empty cell and no piece left over.

Bubble Shooter

Aim your launcher and fire colored bubbles up into the wall — bank shots off the side walls for tricky angles — and match 3 or more of the same color to pop them, with dangling bubbles falling away too. Watch for 💣 bombs that blast everything nearby and ⭐ Color Bursts that clear every bubble of one color at once. Miss too many times and a fresh row pushes the whole wall down toward the red line. Clear a wall and the game automatically moves you to the next level.

Color Flood

Flood the whole board with one color in as few moves as possible. Every tap floods outward from the corner, merging more of the board into one color — the goal is covering the whole board within a limited number of taps.

Number Shooter

Fire numbered tiles up into five columns and match equal numbers to merge them into double. Tiles touching an equal number above, beside or below merge, and merges can chain into big combos. Every few shots a new row of tiles drops from the ceiling, so keep every stack below the red danger line and chase a high score.

One-Line Draw

Trace every line of a diagram in one continuous stroke without retracing any line. A classic 'Euler path' puzzle — the goal is tracing every edge of the diagram exactly once without lifting your finger or crossing a line twice.

Pac-Man

Guide Pac-Man through the maze, clearing every dot while dodging four ghosts — Blinky, Pinky, Inky, and Clyde. Grab one of the four flashing power pellets in the corners to turn the ghosts blue and hunt them for a few seconds, and use the side tunnel to slip from one wall straight out the other.

Perspective Cube

Rotate a 3D wireframe cube in 90-degree steps to match a target orientation. Builds spatial rotation intuition — the goal is picturing how each 90-degree turn changes which face points where.

Shadow Match

Match each 3D shape to its correct 2D shadow silhouette. Tests 3D-to-2D spatial reasoning — the goal is recognizing which flat silhouette each 3D shape would actually cast.

Symmetry Matrix

Complete the missing quadrant of a grid to achieve full mirror symmetry. Three quadrants are already given — the challenge is figuring out exactly what belongs in the missing one so the whole grid becomes perfectly symmetric.

Tetris

Guide each falling tetromino into place to fill and clear complete rows before the stack reaches the top. Rotate with ↺ / ↻, flip a half-turn with 180°, move with ◀ / ▶, and soft- or hard-drop with ▼ / ⤓ — every on-screen button doubles as a keyboard key (Z/X to rotate, Shift or F to flip, arrows to move, Space to hard-drop), shown right on the button. Clearing several rows with one piece scores far more than clearing them one at a time, and the pace speeds up every level.

Tile Rotate

Rotate pipe-segment tiles to connect a continuous circuit from start to end. Only rotation is allowed, not repositioning — the challenge is figuring out which orientation makes each tile's pipe openings line up with its neighbors.

Bridges

Connect islands with bridges so each island's bridge count matches its number. A classic 'Hashiwokakero' logic puzzle — bridges can only run in straight horizontal or vertical lines and never cross, and every island must end up connected into one single network.

Knight's Tour

Move a chess knight so it visits every square on the board exactly once. A classic chess puzzle — using only legal knight moves, the goal is covering the entire board without ever landing on a square twice.

Light-Up

Place light bulbs so every white cell is illuminated, with walls blocking the light. A classic 'Akari' logic puzzle — no two bulbs may shine light on each other, and the goal is lighting every white cell using as few bulbs as the walls allow.

Reflex Beam

Place diagonal mirrors to redirect a laser beam into the target sensor. Only diagonal mirrors are available, so the goal is finding the placement that redirects the beam through exactly the right sequence of turns to reach the target.

Solitaire

Classic Klondike solitaire — draw from the stock, build tableau columns down in alternating colors, and stack all 52 cards onto the four foundations by suit, Ace to King.

Tower of Hanoi Lite

Move a stack of disks from the first peg to the last, never placing a bigger disk on a smaller one. The classic disk-stacking puzzle — every move is legal as long as you never place a bigger disk on a smaller one, and there's always a minimum number of moves to solve it in.

Unblock

Slide cars out of the way to clear an exit path for the red car. Every car can only slide along its own row or column — the goal is clearing a path so the red car can slide all the way to the exit.

Water Pouring Riddle

Measure an exact volume of water using three jugs of different capacities. A classic water-jug riddle — with only fill, empty and pour moves allowed, the goal is finding the exact sequence that leaves the target amount in a single jug.

Anagrid

Rearrange a scrambled 4x4 letter grid so every row and column spells a word. Every row and column is a real word when solved, so swapping letters into place is really solving several overlapping word puzzles at once.

Cross-Shift

Shift rows and columns of letters until the top row and left column both spell real words. Only row and column shifts are allowed (no swapping individual letters) — the trick is finding shifts that fix both a row and a column at once.

Decipher

Crack a monoalphabetic substitution cipher to reveal a hidden quote. Every letter always maps to the same substitute letter, so spotting common word patterns is the key to cracking the whole quote.

Letter Weave

Connect adjacent letters in a grid to spell valid words before time runs out. Only adjacent letters (including diagonals) can connect — the goal is racing to trace out as many real words as you can before time runs out.

Scrabble

A classic word-tile match against a friend — take turns building words on a bonus-square board over however many days you want, no accounts needed.

Vowel Stripper

Guess a famous phrase or proverb shown with every vowel removed. With every A, E, I, O and U stripped out, the challenge is recognizing a familiar phrase from its consonant skeleton alone.

Word Cross

A mini crossword — use the Across and Down clues to fill every square, with shared letters at each intersection helping confirm your answers.

Word Ladder

Change one letter at a time to transform a start word into an end word. Each step must be a real, valid word — the fun is finding the shortest chain of one-letter swaps that bridges two very different words.

Word Shift

Rotate letter rows to align them into valid words. Every row starts scrambled, and shifting one row never touches the others, so the puzzle is about finding the right rotation for each row independently.

Wordle

Guess a hidden 5-letter word in 6 tries, with green/yellow/gray feedback after every guess. The classic word-deduction game — each guess narrows down the hidden word using letter-position feedback.