Détective Mathéo is a mathematics card game. The box contains three games: additions, subtractions, and multiplications. Cards are displaying calculations on one side and results on the other side. Players choose a card set, shuffle the cards, and put the pile between them with the calculations visible. They flip over the topmost card which now shows results and place this card next to the pile. The aim is to be the first to find the only calculations whose result is on the result card. The player who first finds the right pair gives the result aloud and then the associated calculation. If they are correct, he then wins the "Results" card which is worth one point. If they are wrong, the are out for the rest of that round. At the end of the game, one card will be left on the table, the player who has won the most card is the winner of the game.