How to Play

Solve a stream of arithmetic questions - addition, subtraction, multiplication, division, and modulo - chosen from three difficulty levels (Easy: 1-9, Medium: 10-99, Hard: 100-999). Each question appears with a countdown ring that shifts from blue to yellow to red as time runs low. Type your answer and press Enter, or use the on-screen keypad. Correct answers build a streak and award more points at higher difficulty; wrong or timed-out answers reveal the correct value and reset your streak. There's no fixed question count - keep going for as long as you can, chasing your best streak and score before a mistake catches up with you.

Unscramble the letters of a hidden word before time runs out, or switch to Cipher mode, where each letter is replaced by a number and you crack the code using the key shown on screen. Words range from short everyday ones to trickier six-letter puzzles, and some accept more than one valid answer if the letters form multiple real words. Type your guess and submit - a correct answer moves you to a new word immediately, while a wrong guess simply lets you try again. Switch modes anytime from the selector to alternate between rearranging letters and decoding numbers.

Test your reflexes two ways. In Simple mode, wait for the screen to turn green then click or tap as fast as you can - clicking too early restarts the wait. Your reaction time in milliseconds is rated from lightning-fast to needs-practice. In Grid mode, a 3x3 grid flashes one cell red at a time across several rounds - tap the lit cell the instant it appears. Once all rounds finish, you'll see your average reaction time and a full breakdown of every round's result, so you can track whether you're getting faster as you go.

Watch a stream of words appear one at a time, each visible only briefly before the next replaces it. Once the stream ends, type out every word you can remember, in any order, separated by spaces or new lines. Your score is based on how many words you correctly recall, with credit for accuracy too. Easy mode shows fewer words at a gentler pace; Hard mode shows more words flashing by much faster, making it a genuine test of short-term recall under pressure. After submitting, you'll see a full breakdown of hits, misses, and any extra words you typed that weren't actually shown.

Fill the grid so every row, column, and box contains each number exactly once - classic Sudoku logic, no guessing required if you reason it through. Choose from three sizes: 6x6 for a quick warm-up, the traditional 9x9, or a 12x12 grid for real number-placement stamina. Click a cell, then pick a number from the on-screen keypad or your keyboard to fill it in. Wrong entries are flagged so you can course-correct, and a hint button is there if you get stuck. The puzzle is solved the moment every cell is correctly filled - no timer pressure, just pure deduction.

Drag each geometric shape - squares, triangles, circles, hexagons, and more - into the outlined slot that matches its shape category. Easy mode has fewer pieces to place, while Medium and Hard increase the piece count and pack the board with more shapes to sort at once. There's no rotation needed; the challenge is scanning the board, spotting which outline matches which piece, and placing every one correctly. The puzzle is complete once each piece sits in a matching slot - a fast, visual sorting challenge that rewards quick shape recognition over careful calculation.

A classic sliding tile puzzle: an image is cut into a grid of numbered tiles with one or more blank spaces, then shuffled. Slide tiles into the blank space - by clicking a tile next to it or swiping in its direction - to gradually reconstruct the original image. Easy mode uses a smaller grid with a single blank tile; Medium and Hard use larger grids with multiple blanks, making the sequencing considerably trickier. Every shuffle is generated using only legal moves, so each puzzle is guaranteed solvable. The puzzle is finished once every tile is back in its original position.

Pour colored liquid between bottles until each one holds only a single color. Click a bottle to select it, then click another to pour the top color across - a pour only works if the destination is empty or already topped with the same color, and has room left. Plan your sequence carefully, since a bad pour can block your path to a solution. Difficulty scales from fewer colors and more empty bottles (Easy) to many colors with barely any spare room to maneuver (Hard). Every puzzle is generated with a guaranteed solution, so getting stuck just means rethinking your pour order.

Sixteen face-down cards hide eight matching pairs of symbols. Flip two cards at a time to reveal them - if they match, they stay face-up; if not, both flip back down a moment later. Use what you've seen to remember where each symbol sits and clear the whole board in as few moves as possible. There's no timer, so take your time, though your move count and elapsed time are both tracked and reflected in your final result. It's pure visual memory: fewer moves and less time spent finding every pair means a better score.

A short number sequence is shown with one term missing, marked with a question mark that can appear anywhere - start, middle, or end. Work out the underlying rule - it could be simple addition, multiplication, squares, cubes, Fibonacci-style sums, or powers of two - and pick the missing number from four options before the 30-second timer runs out. A correct answer moves you straight to a new sequence; a wrong or timed-out answer reveals the right value first. Your running total of correctly solved sequences is tracked throughout, so keep the streak going as long as you can.

Two sentences are displayed together, and you're timed on how quickly and accurately you can type them out exactly as shown. Each letter you type is checked live, turning green when correct and red when it doesn't match, so mistakes are visible as you make them. Once you finish the full passage, you'll get your total time, words-per-minute, accuracy percentage, and an overall score out of 100. A different pair of sentences is chosen at random each round, so you can play again and again without ever memorizing the same text twice.

There is no gravity here — you are in full control. Hold up or down (arrow keys, W/S, or the on-screen buttons) to steer a missile through an oncoming field of rocks. Most rocks are large and sit still; smaller ones drift horizontally, bob vertically, or move diagonally, color-coded so you can read the field at a glance. The pace starts slow but climbs steadily, with rocks arriving faster and more often the longer you survive. Reach 999 points to win — it takes a very long, very clean run to get anywhere close.

Slide all tiles on a 4x4 board in one direction at a time using the arrow keys or a swipe. Tiles with the same number merge into one when they collide, doubling their value - two 2s become a 4, two 4s become an 8, and so on. A new tile appears after every move, so the board steadily fills as you play. Reach a single tile worth 2048 to win, though you can keep playing beyond that to push your score even higher. The game ends if the board fills up completely with no possible merges left.

A 9x9 grid hides 10 mines among its squares. Click a square to reveal it - if it's safe, it shows a number telling you how many mines are touching that square, which is your clue for finding the rest. Right-click, or long-press on touch devices, to flag a square you suspect hides a mine, helping you track your reasoning as you go. Your very first click is always guaranteed safe, so there's a fair starting point every game. Reveal every safe square without ever clicking a mine to win; click a mine, and it's game over instantly.

Four items are shown together, and one of them doesn't belong with the rest. The odd one out could be the only non-prime number among primes, the only multiple that doesn't fit a pattern, an even number hiding among odd ones, or a single item from an unrelated category dropped into a group of fruits, animals, colors, or countries. Study all four options and click the one that doesn't belong. A correct pick moves you straight to the next round, while a wrong pick reveals the actual answer first. Your running score tracks how many you've gotten right.

Nine tiles are laid out in a grid, each labeled with its own random two-digit number. Watch closely as a sequence of tiles lights up one after another, then type back every number you saw, in the exact order shown, separated by spaces or commas. Choose Level 1 for a shorter five-number sequence, or Level 2 for a tougher ten-number challenge. Because the numbers themselves are randomized every round, you can't rely on memorizing fixed positions - you have to actually track the values. Get it right and a new sequence begins immediately; get it wrong and the correct sequence is revealed first.

Navigate a generated maze from the bottom to one of two exits at the top before rising water swallows it whole. You get a ten-second head start before the flood begins, then it takes a full minute to rise from bottom to top. Most passages are blocked by locked doors - solve a quick addition or subtraction question to open one, or backtrack and try a different route instead. Move using the on-screen arrows or your keyboard. Reach either exit before the water reaches you to escape; every maze is randomly generated, so no two runs are ever the same.

Play the classic three-in-a-row game against the computer on a 3x3 grid. You play as X, the computer plays as O, and you take turns clicking empty squares until someone lines up three symbols in a row - horizontally, vertically, or diagonally - or the board fills up in a draw. The computer plays a sharp strategic game most of the time, but it isn't flawless, so a well-planned attack can occasionally catch it out. Your running wins, draws, and losses are tracked across rounds, so you can see how you're doing against it as you keep playing.