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FREE GAME
Dots and Boxes
Claim boxes by completing their fourth side. Most boxes wins against the computer.
You
0
Computer
0
Record (W-L-T)
0-0-0
Your turn - click a line.
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Why Use Our Dots and Boxes?
Classic Pencil-and-Paper Game
Take turns drawing one line between two dots - complete a box's fourth side to claim it.
Extra Turn on Completion
Claim a box and you immediately get to go again, exactly like the original game's rules.
Smart Computer Opponent
The computer claims any box it can and avoids handing you a free box when a safer move is available.
Three Grid Sizes
Play on a 4x4, 5x5, or 6x6 grid of boxes depending on how long you want the game to run.
Win/Loss Record Saved
Your results against the computer are saved on this device.
100% Private
Everything runs in your browser. Nothing is ever sent to a server.
Frequently Asked Questions
How do I play Dots and Boxes?
Click any line between two dots to draw it. Complete the fourth side of a box to claim it and get an extra turn.
How does the computer play?
It claims any box it can immediately, and otherwise avoids drawing a line that would let you claim a box on your next turn.
How do I win?
Have more boxes than the computer once every line on the board is drawn.
Can I choose the board size?
Yes. Pick a 4x4, 5x5, or 6x6 grid of boxes before starting.
Is my record saved?
Yes. Your wins, losses, and ties against the computer are saved in your browser's local storage.
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Unit Converters (111)
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Games and Puzzles (16)
View allMemory MatchClassic card-matching memory game with three difficulty levels. Tracks your moves and time, and saves your best score so you can try to beat it.Tic-Tac-ToePlay Tic-Tac-Toe against a friend or the computer. Choose an easy opponent or an unbeatable one, and track your win, loss, and draw record.HangmanClassic word-guessing game with Animals, Countries, Food, and Everyday Objects categories. Guess letters before you run out of tries.2048Slide and merge tiles to reach 2048. Play with arrow keys or swipe on mobile, and try to beat your best score.Word Search GeneratorGenerate a word search puzzle from a theme or your own word list, then click the first and last letter of a word to find it.SudokuPlay Sudoku with three difficulty levels. Every puzzle is generated with a guaranteed unique solution, with notes mode and a mistake checker.Daily WordA new 5-letter word puzzle every day. Guess the word in 6 tries, build your streak, and share your result.MinesweeperClassic Minesweeper with three difficulty levels. Your first click is always safe, flag mode works great on mobile, and your best time is saved.Sliding PuzzleThe classic 8-puzzle and 15-puzzle sliding tile games. Every shuffle is guaranteed solvable, with a move counter and best score saved.Lights OutClick a light to toggle it and its neighbors. Turn every light off to win, with three difficulty levels and your best move count saved.Simon SaysWatch the color and sound pattern, then repeat it back. Each round adds one more step. How many rounds can you remember?Reaction Time TestClick as fast as you can the moment the screen turns green. Catches false starts, tracks your average, and saves your best reaction time.Connect FourDrop pieces to connect four in a row before the computer does. The AI thinks several moves ahead, so it plays a genuinely strong game.MastermindCrack the hidden 4-color code in 10 guesses or fewer using black and white peg feedback. Tracks your wins, losses, and fewest guesses to solve.SnakeClassic arcade Snake. Steer with arrow keys or swipe on mobile, eat food to grow, and avoid the walls and your own tail. Best score saved.Tower of HanoiMove the whole stack of disks to the last peg in the fewest moves possible. Choose from 3 to 7 disks and compare against the mathematical minimum.
Developer Tools (8)
Password GeneratorGenerate strong, random passwords with custom length and character sets. Includes strength indicator and copy button.Base64 Encoder/DecoderEncode text or files to Base64 and decode Base64 strings back to plain text. Supports URL-safe mode.Number to WordsConvert any number into English words. Supports up to trillions, ordinal mode, and currency format.Screen Resolution CheckerCheck your screen resolution, viewport size, device pixel ratio, color depth, browser, and OS instantly.Aspect Ratio CalculatorCalculate the aspect ratio of any dimensions, or find a missing width or height from a known ratio.Vanishing Note - Self-Destructing NotesSend a secret note that self-destructs after being read. Encrypted in your browser, shared as a single-use link.Script SplitterPaste a long script and split it into copy-ready chunks of any character limit. Copy each part one at a time with a single click.Print PadA multi-page document editor with text formatting, tables, images, margins, and find and replace. Print or save as PDF straight from your browser.
Fun and Random (19)
View allDice RollerRoll any number of dice in any combination - d4, d6, d8, d10, d12, and d20. Instant results.Coin FlipperFlip a virtual coin and get heads or tails instantly. Flip multiple coins at once.Random Quote GeneratorGet a random inspirational quote with one click. Hundreds of famous quotes from history's greatest minds.Random Number GeneratorGenerate random numbers within any range. Generate multiple numbers and optionally keep them unique.Yes or No GeneratorCan't decide? Get a random yes or no answer instantly. Includes a maybe option for tough decisions.Keyboard TesterTest every key on your keyboard online. Choose from Windows full, TKL, 75%, 65%, 60%, Mac, and MacBook layouts.Dead Pixel TesterCheck your monitor for dead or stuck pixels using solid color screens. Red, green, blue, black, white, and more.Camera Shutter Count CheckerUpload a JPEG photo to check your camera's shutter count and view full EXIF camera details. Supports Canon and Nikon shutter count detection.Magic 8-BallAsk the Magic 8-Ball any yes-or-no question and shake it for an answer. All 20 classic responses, just like the original toy.Typing Speed TestTest your typing speed and accuracy with 10 different passages. Live WPM tracking and character-level feedback.Pros and Cons ListBuild a structured pros and cons list for any decision. See the balance at a glance, then copy or print your list.Baby Name GeneratorGenerate baby name ideas by gender, origin, starting letter, and meaning. Find the perfect name for boys, girls, or unisex.Username GeneratorGenerate unique username and gamertag ideas from your name or keywords. Choose a style and get instant results.Fantasy Name GeneratorGenerate fantasy names for characters, races, and places. Perfect for D&D, fiction writing, and worldbuilding.Business Name GeneratorGenerate creative business and brand name ideas from your keywords. Pick a style and get instant suggestions.New Year's Resolution TrackerSet New Year's resolutions, break them into milestones, and track your progress throughout the year.Spin the WheelAdd names, spin the wheel, and let it decide. Great for random picks, giveaways, and classroom activities.Random Team GeneratorPaste a list of names and split them into random, balanced teams instantly. Set the number of teams, add custom team names, and re-shuffle as many times as you like.Chore WheelBuild a weekly chore schedule for your household. Add people and tasks, then randomize assignments fairly or set them manually.
Design and Color (4)
Color ConverterConvert colors between HEX, RGB, HSL, and HSB formats instantly with a live color preview.Random Color GeneratorGenerate random colors with their HEX, RGB, and HSL values. Copy any format instantly.QR Code GeneratorGenerate a QR code from any URL or text. Download as PNG instantly. Free, private, no sign-up.Color Palette GeneratorGenerate harmonious color palettes from any base color. Complementary, analogous, triadic, and more.
Time Tools (6)
Alarm ClockFree online alarm clock. Set an alarm time and get a browser alert and sound when it goes off.Online TimerFree countdown timer. Set hours, minutes, and seconds and get an alert when the time is up.StopwatchFree online stopwatch with lap times. Start, stop, and reset with a single click.Time Zone ConverterConvert time between any two cities or time zones instantly. Great for scheduling across countries.Sleep CalculatorCalculate the best time to go to sleep or wake up based on 90-minute sleep cycles.Holiday CountdownLive countdowns to major holidays - Christmas, New Year, Thanksgiving, Halloween, and more.