Interactives

Trace traditional Kasuti embroidery motifs so the design appears identical on both sides — an alternating Eulerian tour puzzle on a grid.

Toss a coin until heads first outnumber tails, record the fraction, and repeat.

Peter has three bank accounts. He can transfer between them, but a transfer must exactly double the recipient's balance. Can he always empty one account?

Solve logic puzzles on an island where knights always tell the truth and knaves always lie!

Learn about error detection and correction through an interactive game about parity bits!

Visualize integer partitions through Ferrers diagrams and explore the Rogers-Ramanujan identities interactively.