Two great pirates, one called Plus and the other By, try to get the mythic treasure of mathematics. They go through epic monsters and great difficulties. He who arrives first at the mythic island will be the great winner taking with him the treasure of maths. And he will be, "Captain Number". Captain Number is a game of knowledge and math, there are 2 people or 2 teams, trying to go through puzzles where one makes the math problems and the other one tries to solve it, plus answering in the course of the game, cards with questions.