This 2-4 player game is designed to help students understand unit size within the metric system. There are 3 decks of cards included in the set: length, mass, and capacity. Students play a card game with one of the decks while trying to make pairs of equivalent values. Each card deck contains 54 cards showing a numeric unit and a metric unit. Students play a "war" type game to compare units and numbers to determine the largest (or smallest) value.