Featured
Medium
Binary
Balance the grid with black and white cells. No three in a row, equal counts per line, and no two identical rows or columns.
New
Hard
Knight's Tour
Move a chess knight to visit every square on the board exactly once, following its L-shaped movement rules.
Medium
No Four in a Row
Place X and O marks on the grid without ever creating four consecutive identical marks in any direction.
Hard
No Repeats
Fill the grid with numbers such that no digit repeats in any row or column. A step up from classic latin squares.
Featured
New
Expert
Skyscrapers
Arrange buildings by height so that the number of visible skyscrapers from each vantage point matches the clues.
Hard
Sudoku
The classic number puzzle. Fill a 9×9 grid so every row, column, and 3×3 box contains each digit exactly once.
Medium
Link
Connect every pair of matching dots with pipes — without crossing — until the whole board is filled. Simple, addictive, satisfying.
Medium
More or Less
Fill the grid with digits so every row and column has no repeats, while obeying the greater-than and less-than signs between adjacent cells.
Expert
N-Queens
Place N queens on an N×N chessboard so that no two queens threaten each other — no shared row, column, or diagonal.
New
Medium
Dominosa
Identify and place all domino tiles hidden within a number grid. Each distinct domino appears exactly once — no overlaps allowed.
Popular
Medium
Minesweeper
Reveal cells without triggering any mines. Use number clues to deduce which squares are safe and flag all hidden bombs.
Popular
Medium
2048
Slide tiles to merge matching numbers and reach 2048. Simple to learn, surprisingly deep — every move counts toward your high score.
New
Medium
Nonogram
Fill in the correct cells using row and column number clues to reveal a hidden pixel-art image. Also known as Hanjie or picture-cross puzzles.
Easy
All Off
Toggle lights on a 5×5 grid — each click flips the selected cell and its neighbors. Turn all lights off to win in as few moves as possible.
Classic
Medium
Code Breaker
Crack a secret 4-color code in 10 attempts. After each guess, black and white pegs reveal how close you are — pure deductive logic.
Easy
Word Search
Find all hidden words in a letter grid — they can run horizontally, vertically, or diagonally. Race the clock to find them all.
New
Medium
Sliding Puzzle
Slide numbered tiles into order on a 4×4 (or 3×3) grid with only one empty space to maneuver. The classic 15-puzzle reinvented.
New
Easy
Memory Match
Flip cards to find all 8 matching pairs. Remember where each symbol is hiding and clear the board in as few attempts as possible.
New
Medium
Color Flood
Start from the corner and flood-fill the board by choosing colors to expand your territory. Cover every cell before moves run out.
New
Easy
Memory Sequence
Watch a growing color sequence and repeat it exactly. Each correct round adds one more step — how long can your memory hold?
New
Easy
Tic-Tac-Toe
Face an unbeatable minimax AI in the timeless 3×3 duel. Pick your difficulty and try to force a draw against a perfect opponent.
New
Medium
Four in a Row
Drop discs and line up four in a row before the AI does. A look-ahead opponent makes every column choice matter.
New
Hard
Reversi
Outflank the AI to flip discs to your color and rule the 8×8 board. Grab the corners — they can never be taken back.
New
Medium
Tower of Hanoi
Move the entire stack to the far peg, never placing a larger disc on a smaller one. Can you match the perfect 2ⁿ−1 solution?
New
Easy
Maze
Race from the start to the exit through a freshly generated maze every time. Swipe, tap, or use the keys to find the way out.
New
Hard
Gomoku
Line up five stones in a row before the AI does. A deceptively deep battle of attack and defense on a 13×13 board.
New
Medium
Checkers
Jump, chain captures, and crown your kings to outplay a thinking AI. Mandatory captures keep every move sharp.
New
Medium
Pipes
Rotate each tile to link every pipe into one glowing network with no loose ends. Watch the power flow from the source.
New
Hard
Bridges
Build bridges between numbered islands so each has exactly the right number of links — and the whole map connects into one.
New
Arcade
Snake
Eat, grow, and survive on the classic arcade grid. Steer with the keys or a swipe — one wrong turn and it's game over.
New
Medium
Word Guess
Crack the hidden five-letter word in six tries. Green means right spot, yellow means wrong spot — deduce the rest.
New
NP-complete
Satisfy (3-SAT)
Flip switches to make every clause true — the NP-complete problem itself, made playable. Stuck? Hand it to the built-in SAT solver and watch it work.