La incógnita

This is a children's game based on memory. Two to four players scatter some colored little balls on the play board and then use a tube shaped as a question mark and press it by turns against the balls so they stick inside the tube. When there are four balls inside a tube the oldest ball will fall out from the other side of the tube. If the player guesses the color of the ball that is going to fall he takes it and plays again. When a player gets four balls of his color she wins.