Games & Puzzles

Slide numbered tiles on a 4×4 grid to combine them and reach the 2048 tile in this addictive puzzle game.

Improve your mouse accuracy and click speed. Targets appear at random positions - click them as fast as possible. Track your accuracy and average reaction time.

Find your eye's natural blind spot (optic disc) using a monocular fixation test. Cover one eye, fixate on the cross, and discover where the dot vanishes from your field of view.

Stack falling tetrominoes to clear lines in this Tetris-style puzzle game.

Break all the bricks with a bouncing ball and paddle.

Play checkers (draughts) against an AI opponent in your browser.

Play chess against a simple AI opponent in your browser.

Drop colored discs to connect four in a row - horizontally, vertically, or diagonally. Play vs AI or a friend.

Enter a crossword pattern with known letters and question marks for blanks (e.g. "C?T"). Find all matching words from the built-in dictionary.

Generate substitution cipher cryptogram puzzles from quotes or your own text. Solve interactively in the browser.

Roll d4, d6, d8, d10, d12, d20, and d100 individually or in combinations. Track initiative order for up to 8 creatures. History log included.

Train your musical ear by identifying intervals between two played notes.

Guess the hidden word letter by letter before the hangman is drawn. Multiple word categories available.

Toggle lights on a 5x5 grid to turn them all off. A classic logic puzzle.

Choose a story template, fill in nouns, verbs, adjectives, and names, then reveal the hilarious result. Multiple story templates included.

Generate random mazes of any size using recursive backtracking and navigate through them with arrow keys or touch.

Classic concentration card-matching game. Flip cards to find matching pairs as fast as possible.

Sharpen your mental arithmetic with timed addition, subtraction, multiplication, and division questions. Choose difficulty and track your accuracy and speed.

Play the classic minesweeper game. Choose beginner, intermediate, or expert difficulty.

Train your working memory with the dual n-back task. Monitor a sequence of positions and letters and respond when a stimulus matches one from n steps back.

Solve nonogram (picross) puzzles by filling in cells using row and column clues.

Test and train your digit span - the number of digits you can hold in working memory. Numbers are shown briefly; type them back as accurately as possible.

Browser chess clock with configurable time controls (Bullet, Blitz, Rapid, Classical, custom). Tap to switch sides. Includes increment support.

Classic two-player Pong - play against the AI in the original arcade game.

Measure your reaction time with a 5-trial click test. Click as fast as possible when the screen turns green. See your average and percentile ranking.

Speedcubing timer with scramble generator, inspection time, and averages of 5 and 12 (Ao5 / Ao12) in WCA style.

Calculate word scores for Scrabble or Words With Friends including double/triple letter and word bonuses. Supports blank tiles.

Play the classic Simon Says color memory game in your browser. Watch the growing color sequence and repeat it back. How far can you go?

Play the classic 15-tile sliding puzzle. Shuffle and solve it by sliding tiles into the empty space.

Classic snake game - eat apples, grow longer, avoid walls and yourself.

Play classic Klondike Solitaire card game in your browser.

Experience the Stroop effect - identify the ink color of a color word as fast as possible. Measures cognitive interference when the word and color conflict.

Generate a new Sudoku puzzle at easy, medium, or hard difficulty, then solve it in your browser with full validation.

Instantly solve any 9×9 sudoku puzzle online. Enter your puzzle, click Solve, and get the complete solution in milliseconds. 100% client-side.

Play Tic-Tac-Toe against an unbeatable AI or with a friend in two-player mode.

Click the moles as they pop up! A classic reflex-testing arcade game.

Transform one word into another by changing one letter at a time, with each step being a valid word.

Create printable word search puzzles with your own word list. Words can be placed in 8 directions.

Unscramble letters to find all valid English words. Filter by length. Useful for Scrabble, Wordle, and other word games.

Enter your known letters, positions, and misses to filter the Wordle word list. Narrows thousands of 5-letter words to only valid candidates - no dictionary upload needed.

Digital Yahtzee score card for up to 4 players. Auto-calculates upper section bonus, Yahtzee bonuses, and final totals.