All Interactives (40)
Showing 40 of 40 interactives
Ascending-Descending Grid Puzzle
Fill a grid with numbers that are ascending in rows and descending in columns. A constraint satisfaction puzzle!
Assisted Game of Nim
Learn the XOR strategy! Visualize how powers of 2 determine winning moves with color-coded borders.
Bagchal Game
Play the traditional Nepali board game where tigers try to capture goats while goats try to block tigers.
Balanced Ternary Representation
Explore balanced ternary using digits T (-1), 0, and 1. Add or subtract powers of three to match the target number.
Binary Number Representation
Learn how numbers are represented in binary (base-2) format through an interactive guessing game.
Binary Search Magic Trick
Perform an amazing magic trick that reveals how binary numbers work. Think of a number and watch the magic happen!
Bulgarian Solitaire
A mathematical card game where you repeatedly redistribute cards into piles until reaching a stable configuration.
Chessboard Repaint Puzzle
Repaint rows, columns, or 2x2 squares to achieve exactly one black square. A puzzle about parity and operations!
Computing π from Coin Tosses
Toss a coin until heads first outnumber tails, record the fraction, and repeat.
Craps: An Exploration
Experience the classic casino dice game! Roll two dice and learn about probability as you discover the rules of the opening throw.
Domino Retiling Puzzle
Rearrange dominoes on a grid to achieve the target configuration. A puzzle about combinatorics and tiling!
Ferrers Diagrams & Rogers-Ramanujan
Visualize integer partitions through Ferrers diagrams and explore the Rogers-Ramanujan identities interactively.
Game of Nim
A classic two-player game of strategy. Take turns removing stones from heaps. The player to take the last stone wins!
Game of Sim
A strategic two-player game where you take turns coloring edges between vertices, trying to avoid creating a triangle of your own color.
Grid Tiling Puzzle
Based on IMO 2025: Place rectangular tiles on a grid so that each row and column has exactly one uncovered square.
Kasuti
Trace traditional Kasuti embroidery motifs so the design appears identical on both sides — an alternating Eulerian tour puzzle on a grid.
Knights and Knaves I
Solve logic puzzles on an island where knights always tell the truth and knaves always lie!
Knights Exchange Puzzle
A classic chess puzzle where you must exchange the positions of white and black knights using legal knight moves.
N-Queens Puzzle
Place as many queens as possible on an nxn chessboard so that no two queens attack each other.
Neighbor Sum Avoidance
Arrange numbers in a circle so that the sum of two neighbors is never divisible by 3, 5, or 7. An interactive graph theory puzzle!