This is one of HABA's mini-games, which comes in a tin on a key chain. In the tin are 4 big wooden boats, 4 small wooden boats, 3 small dice and a set of instructions. The boats are each painted in four different colors (yellow, blue, green and red).
Players have three rolls of the dice to try to collect as many flags of one color, so they can get a boat or both boats of that color. If the boat already belongs to another player, you take the boat from him. The game ends when all the boats have been captured. The big boat scores 2 points, and the small boat scores 1 point. The player with the most points win.