Icosian game

The icosian game is a mathematical game invented in 1856 by Irish mathematician William Rowan Hamilton. It involves finding a Hamiltonian cycle on a dodecahedron, a cycle using edges of the dodecahedron that passes through all its vertices. Hamilton sold his work to a game manufacturing company, but it was not commercially successful. Although Hamilton was not the first to study Hamiltonian cycles, his work on this game became the origin of the name of Hamiltonian cycles.