Installed static game
Meowdoku
One cat per row, column and region: three levels, explained hints and solution.
Open gameLogic in motion
Online games
Interactive activities where you can observe, make a move, and put a strategy to the test. Start right away—no account required.
Installed static game
Photo Puzzle
Reconstruct 20 photos with 3×3 to 6×6 grids. Use your own photo, hints and the solution.
Open game
Interface in 4 languages
5×5 Pentadoku
Twelve uniquely solvable puzzles, candidate analysis and region building.
online_games.items.pentadoku.cta
Interface in 4 languages
Mazes
Find the exit in a fresh maze every time. Three levels, touch and keyboard controls, hints and an optional route.
Enter the maze
Installed static game
No Pairs
Place 16 cards in a 4×4 grid without repeating rank or suit: three levels, hints and solution.
Open game
Interface in 4 languages
Italian draughts: computer or room
Play the computer at three levels or a remote friend, with up to three spectators.
Play now
Installed static game
Tangram — Seven pieces, endless ideas
Seven figures, three levels, progressive hints and solutions. Drag, rotate and flip the pieces, including on tablets.
Open game
Interface in 4 languages
Chess: computer or room
Play the computer at three levels or a remote friend, with up to three spectators.
Play now
Installed static game
Guided Sudoku
Three levels, explained hints and initial, playing and solution views.
Open game
Installed static game
The poisoned bottle
1 to 4,096 bottles: binary mixtures, automatic detector count and a step-by-step solution in one round.
Open game
Installed static game
3×3 Rubik’s Cube
Scramble and solve the cube visually with two step-by-step guided solution modes and animated moves.
Open game
Installed static game
The Matchstick Game
Choose how many matchsticks to take and claim the last one: challenge the computer or play with a friend on the same device.
Open game
Installed static game
Say 100 to win
Reach the exact target before the computer or a friend. Both the target and maximum increment are configurable.
Open game
Installed static game
Connect Four
Challenge the computer or a friend and connect four discs. Three difficulty levels and same-device play.
Open game
Interface in 4 languages
Frogs on leaves
A swapping puzzle: move the frogs to the opposite side using valid steps and jumps.
Play now
Interface in 4 languages
Four fours clock
Build the clock numbers using exactly four 4s and the available operations.
Explore the clock
Interface in 4 languages
Darts: three throws
36 number boards: reach the target with exactly three throws and discover every combination.
Play now
Interface in 4 languages
Find the symbol
Compare the cards and be first to find their matching symbol, solo or in a room.
Play solo or join a room
Interface in 4 languages
The four signs
42 challenges: use +, −, × and ÷ once each and calculate from left to right.
online_games.items.four_signs.cta
Interface in 4 languages
Six cards and number systems
Convert numbers between bases 2 and 16 and explore the six-card trick, binary lights and the poisoned-bottle game.
Open the lab
Interface in 4 languages
Find the word: five clues
Thirty-six new English word-association puzzles with hints and explained solutions.
Open the lab
Interface in 4 languages
Repeated digits: five 5s and six 6s
Forty arithmetic challenges with verified solutions and a custom workspace.
Open the lab
Interface in 4 languages
Logic matching: people and professions
Fifty uniquely solvable deduction grids with clues, checking and explanation.
Open the lab
Interface in 4 languages
Four or five numbers, one hundred targets
Choose 4 or 5 numbers, entered manually or drawn randomly: explore results from 1 to 100, with formulas and steps.
Open the lab
Interface in 4 languages
Venn diagrams: explore sets
Colour the regions of two or three sets and compare complete union, intersection and other operations.
online_games.items.venn_sets.cta
Interface in 4 languages
Josephus circle
Explore the Josephus problem and follow the elimination order step by step.
Start the simulation