To provide collection cards which enable interconnected games with an electronic game machine, encouraging users to collect them more, and game system using them.

These collection cards (10) include a rule card (11) and two or more character cards (12A and 12B). On the front surface (11a) of the rule card, data recording areas (113 and 114) are formed, where the rule program data determining the interconnected game rules can be recorded. On the front surface (12a) of each character card, a data recording area (123) is formed, where parameter data can be recorded. A game system (1), which is comprised of these collection cards, an electronic game machine, and a game cartridge (30), displays the interconnected game based on the rule program data from the rule card as well as the parameter data from the character cards.