From the rules: "Combination is a game based on the binary numbering system for 2 to 6 players. It is extremely fast moving and action packed. Anyone who can add and subtract will readily enjoy this high-tech game of the 21st century." This game has a safecracking theme, but it consists mainly of racing to mentally convert decimal to binary, collecting cards with each race won in an attempt to match a predetermined pattern. There's no strategy in this game; the person who has the most facility with mental subtraction has an edge, but ultimately the winner depends on the completely random draw of the cards.