Tic-tac-toe
A quick game of Xs, Os, and three in a row.
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Games
Choose a short puzzle or reaction game, read its controls and start when ready. Games work without an account. Any saved progress or sound is described in the game itself; browser sleep can interrupt timed play.
Games
100 Results
Games
Memory match
Turn over cards and find all eight matching pairs.
Snake
Collect food, grow longer, and stay out of your own way.
2048
Slide matching tiles together and build your way to 2048.
Minesweeper
Follow the numbers and uncover the safe squares.
Sudoku
Complete a 9 × 9 number puzzle, one deduction at a time.
Word scramble
Untangle ten everyday words with a little help from a clue.
Reaction test
Wait for green, then see how quickly you can respond.
Sliding puzzle
Slide the tiles and put the numbers back in order.
Connect four
Drop a disc, block your rival, and connect four.
Addition sprint
Add the two numbers.
Subtraction sprint
Find the difference between the numbers.
Multiplication trainer
Multiply the two factors.
Division dash
Find the exact whole-number quotient.
Missing operator
Choose the operation that makes the equation true.
Number sequence
Find the next term of the constant-step or doubling sequence.
Prime detective
Choose the only prime number. A prime has exactly two positive divisors.
Fraction comparison
Compare the two fractions using less than, equal to or greater than.
Percentage quest
Calculate the requested percentage of the amount.
Square roots
Find the positive square root of a perfect square.
Powers of two
Calculate two raised to the displayed exponent.
Binary decoder
Convert the binary number to decimal.
Roman numeral quest
Read the Roman numeral as a decimal number.
Remainder master
Find the remainder after integer division.
Greatest common divisor
Find the greatest positive divisor shared by both numbers.
Least common multiple
Find the smallest positive multiple shared by both numbers.
Average hunt
Add the values and divide by how many values there are.
Median mission
Sort the five values and find the middle one.
Rounding rally
Round to the nearest ten; a final digit of five rounds up.
Operation order
Apply multiplication before addition in the expression.
Negative number trail
Calculate with positive and negative integers.
Algebra balance
Find the value of x in the linear equation.
Ratio recipe
Scale both ingredients by the same factor.
Probability pick
Count favorable outcomes out of the total equally likely outcomes.
Clock arithmetic
Add the duration to a 24-hour clock, wrapping after midnight.
Leap year detective
Find the leap year using the divisible-by-four and century rules.
Angle classifier
Classify an angle as acute, right, obtuse or straight.
Polygon corners
Match the named polygon to its number of corners.
Rectangle area
Multiply the rectangle width by its height.
Perimeter patrol
Add all four sides of the rectangle.
Unit ladder
Convert between metric length units.
Change maker
Calculate the change from a purchase, in cents or kuruş.
Digit sum
Add the individual digits of the number.
Divisibility detective
Choose the only number divisible by the displayed divisor.
Hexadecimal explorer
Convert a hexadecimal number to decimal; A–F represent 10–15.
Triangle check
Decide whether the three positive lengths can make a non-flat triangle.
City block distance
Find the shortest grid distance without diagonal moves.
Logic gates
Evaluate the AND, OR or XOR gate using 0 and 1 inputs.
Binary bit duel
Apply the bitwise operation to each matching pair of bits.
Caesar cipher
Decode the uppercase A–Z word by shifting letters backward by the shown key.
Reverse word
Read the word from right to left and choose the original.
Missing letter
Choose the missing letter using the word and its clue.
Word length
Count letters, including each accented letter as one character.
Alphabet order
Choose the word that comes first in the selected language alphabet.
Vowel hunt
Count A E I O U in English, or A E I İ O Ö U Ü in Turkish.
Color conflict
Choose the ink color, ignoring what the word says. Color labels stay visible on the answer buttons.
Arrow conflict
Choose the direction the arrow points; ignore the written direction.
Symbol count
Count only the requested symbol among the distractors.
Odd symbol
Find the different symbol and select its one-based position.
Pattern continuation
Complete the repeating symbol pattern.
Lights out
A tap flips the cell and its orthogonal neighbors. Turn every light off.
Cross-line switches
A tap flips the entire row and column, counting their intersection once. Turn every light off.
Diagonal switches
A tap flips the cell and its four diagonal neighbors. Clear the board.
Knight switches
A tap flips the cell and every square a chess knight could reach. Clear the board.
Three-state switches
A tap cycles the cell and its orthogonal neighbors through 0 → 1 → 2 → 0. Make every cell zero.
Mini nonogram
Fill the grid to match the consecutive filled-cell runs shown for each row and column. Any matching solution wins.
Binary balance
Fill the 4 × 4 grid: each row and column needs two zeros and two ones, with no three equal neighbors and no duplicate rows or columns.
Sum selectors
Toggle numbered cells so that selected values equal every row and column target.
Magic square
Fill the empty cells with the unused digits 1–9. Every row, column and long diagonal must total 15.
Latin square
Fill the 4 × 4 grid with 1–4 exactly once in each row and column. Given cells are fixed.
Tower of Hanoi
Select a source peg then a destination. Move all four disks to the last peg without placing a larger disk on a smaller disk.
Water jug puzzle
Fill, empty or pour between a 3-liter and a 5-liter jug to leave exactly 4 liters in the larger jug.
River crossing
Take the wolf, goat and cabbage across. The boat carries you and one item. Never leave wolf with goat or goat with cabbage without you.
Box keeper
Push the box onto the marked goal. You can push but cannot pull. Use arrows or direction buttons; undo is available.
Maze escape
Move through open squares from S to E using arrows or the direction buttons. Walls block movement.
Ice maze
Each direction slides you until a wall. Stop exactly on E to win.
Key maze
Collect K before entering E. Move one square at a time and avoid walls.
Path cover
Start at S and visit every square once using adjacent moves. Finish at E. Undo when trapped.
Eight queens
Place eight queens so no two share a row, column or diagonal. Tap a queen to remove it.
Knight tour
Starting at the top-left, visit every 5 × 5 square once with chess knight moves. Undo is available.
Knight collection
Move the knight in an L shape and collect all marked tokens. Revisiting empty squares is allowed.
Peg solitaire
Select a peg, then jump over an adjacent peg into an empty hole. Remove jumped pegs until only one remains.
Frog crossing
Swap the three right-moving and three left-moving frogs. A frog moves forward one square or jumps one frog into an empty square.
Triple coin flip
Each button flips three consecutive coins, wrapping around the row. Turn all coins to zero.
Pancake sort
Choose a position to reverse the entire prefix ending there. Sort 1–7 from left to right.
Adjacent swap
Tap neighboring pairs to swap them. Sort 1–7 from left to right with few moves.
Segment reversal
Select two endpoints to reverse that segment. Sort 1–7.
Fifteen duel
Two players take unused numbers 1–9. The first with any three chosen numbers totaling 15 wins.
Nim
Two players alternate removing one or more stones from exactly one pile. Taking the last stone wins.
Twenty-one stones
Two players take one, two or three stones per turn. The player taking the last stone loses.
Chomp
Choose a square to remove it and every remaining square below and to its right. Taking the top-left poison square loses.
Domino duel
Player 1 places vertical dominoes; player 2 places horizontal dominoes. Tap the upper/left square. A player with no legal move loses.
Dots and boxes
Take turns drawing edges. Completing a box scores a point and gives another turn. Most boxes wins.
Mini reversi
Place a disc to bracket and flip one or more opponent discs in a straight line. No move means an automatic pass. Most discs at the end wins.
Five in a row
Two players take turns placing stones on a 9 × 9 board. First to connect at least five horizontally, vertically or diagonally wins.
Sequence memory
Study the numbered-pad sequence, hide it and repeat it. Complete eight rounds with growing sequences.
Number memory
Study a growing digit string, hide it and type it exactly. Complete eight rounds.
Grid memory
Study the marked squares, hide them and select the same set. Complete eight rounds.
Timing target
Start the clock, then stop as close as possible to the target duration. Play five trials; hidden tabs cancel the current trial.
Target hunt
Tap the numbered targets in ascending order. Complete five shuffled boards; mistakes are counted.
Showing 24 of 100 tools.