Area Formula ExplorerNEW
An interactive journey to visually understand how area formulas for common shapes are derived.
The Classic Game of 15NEW
A game of Tic-Tac-Toe disguised with numbers. Be the first to collect three numbers that sum to 15.
Stone Game III (Strange Rules)
A subtractive game with a custom set of moves. The simple patterns are gone; can you find the new path to victory? This introduces Sprague-Grundy theorem concepts.
Stone Game II
A misère play variation of the classic Bash Game. The goal is to force your opponent to take the last stone. Who will be the unlucky one?
Stone Game I
A classic impartial game, also known as Bash Game. Learn the winning strategy by understanding key numbers.
The Stopped Clock Puzzle
Challenge your logic with a classic time riddle! A stopped clock can be surprisingly tricky. Can you uncover the lost time?
Logic Lab
Learn fundamental programming logic by solving real-world puzzles.
Balance Puzzle IV: The Universal Formula
Don't just solve puzzles, discover the secret formula behind them! An interactive journey into information theory.
Balance Puzzle II: The Next Level
You have 9 coins, and one is known to be heavier. Can you find the fake coin in just 2 weighings?
Balance Puzzle I: The Known Fake
You have 8 coins, and one is known to be heavier. Can you find the fake coin in just 2 weighings?
Water Jug Puzzle III: The Optimal Path
With a 7L and an 11L jug, find a way to measure exactly 2L. Challenge yourself to find the most efficient solution!
Water Jug Puzzle II: A Test of Possibility
With a 6L and a 9L jug, can you measure out exactly 1L? Test the limits of what's possible.
Water Jug Puzzle I: The Basics
Given a 3L and a 5L jug, can you measure out exactly 4L of water? A classic logic puzzle.
Möbius Strip Journey
Explore the fascinating properties of a Möbius strip. Watch an ant crawl along its single surface and discover what happens when you cut the strip.
The Vigenère Square
Master the Vigenère cipher, a powerful polyalphabetic cipher that was unbreakable for centuries.
Secret Color Exchange
Learn how to establish a shared secret in public, based on the Diffie-Hellman key exchange.
Caesar Cipher Wheel
Learn the basics of cryptography with the Caesar Cipher, one of the oldest and simplest forms of encryption.
Froggy's River Hop
Help Froggy cross the river by finding all possible safe paths! A fun introduction to dynamic programming.
Cosmic Base Converter III
Convert a number from one alien base system to another, using Earth's Base-10 as the universal bridge.
Cosmic Base Converter II: Probe Programmer
Learn to convert decimal numbers to binary, octal, or hexadecimal. Master the 'division with remainder' method in our new interactive game!
Cosmic Base Converter
Learn to convert between binary, octal, decimal, and hexadecimal with our fun, interactive space-themed game. Master number systems today!
Time Base Converter
Convert a given duration into different time units (days, hours, minutes). Understand how time works as a multi-base number system.
Insertion Sort: Librarian's Challenge
Learn the insertion sort algorithm by organizing a library shelf, inserting books one by one into their correct sorted position.
Selection Sort: Cargo Manager
Learn the selection sort algorithm by managing a busy cargo dock, finding the lightest box in each pass.
Bubble Sort: Potion Master
An interactive game to learn the bubble sort algorithm by arranging potions of different weights.
Binary Search: Alien Code
An interactive game to learn and master the binary search algorithm by finding a secret code.
General's Horse: Shortest Path Challenge
An interactive game to solve the classic General's Horse problem, finding the shortest path using geometric reflection.
Zeno's Ladder: The Paradox of the Climb
Experience Zeno's paradox firsthand by trying to climb a mountain one step at a time.
The Bird and Two Trains Puzzle
A classic relative speed puzzle. Calculate the total distance a bird flies while two trains travel towards each other. A great test of lateral thinking.
Staircase Climber: A Recursion Puzzle
A classic puzzle about finding the number of ways to climb stairs, which introduces the concept of recursion and the Fibonacci sequence.
Unfolding a Cube: How Many Unique Nets?
Challenge your spatial reasoning by figuring out all the unique ways to unfold a standard cube into a 2D pattern. A classic puzzle in the world of geometry.
Dimension Explorer
Embark on an interdimensional journey to understand the universe's building blocks!
Matchstick Puzzle: 4 Triangles with 6 Sticks
A classic lateral thinking puzzle. Can you form 4 equilateral triangles using only 6 matchsticks? Think outside the box!
Pythagorean Theorem: A Visual Proof
This animation demonstrates the Pythagorean theorem by rearranging four identical right triangles within a larger square, showing that a² + b² = c².
Prime Factorization Tree
Interactively break down any composite number into its prime factors. Grow a tree of numbers and discover the fundamental theorem of arithmetic!
The Binomial Square
Visually explore the formula (a + b)² = a² + 2ab + b² by dividing a square's area. See how algebra and geometry connect!
Distributive Law Explorer
An interactive, visual tool to help understand the distributive law of multiplication, a * (b + c) = a * b + a * c, using shapes and colors.
Abstract Shapes Puzzle
Solve the mystery of the shapes! Each shape represents a unique number. Can you find their values?
Payment Methods
Calculate the number of ways to pay a certain amount using 1, 2, 5, and 10 currency notes.
Count the Rectangles
In the figure below, there are 5 squares connected in a row, forming a larger rectangle. How many rectangles are there in total in this figure?
Straight vs. Flush
Which poker hand is more likely: a straight or a flush? Test your probability skills!
My Birthday Probability
What's the chance someone in your class shares your birthday?
Birthday Paradox
Explore the surprising probability of shared birthdays in a group!
Balance Scale Puzzle
You have a balance scale and three weights: 1g, 3g, and 9g. How many different integer weights can you measure? Remember, weights can be placed on either side of the scale.
The Seven Bridges of Königsberg
A famous old puzzle about a city, its river, and its seven bridges.
The Mystery of the Fake Coin
Help the detective find the one tricky coin among 12! Is it lighter or heavier? Use the magical balance scale to find out in the fewest tries possible!
Empty Bottle Exchange Puzzle
Solve the classic empty bottle exchange riddle: 3 empty bottles for 1 new bottle. How many can you drink?
✨ Magic Number Triangle ✨
Place numbers 1-6 in the triangle so that each side sums to the same value. A fun math puzzle!
Sally's Sisters Riddle
Test your logical thinking with this engaging family riddle. Can you figure out how many sisters Sally has?