An information processing device running a game program offering an improved level of strategy in a game in which a plurality of game content divided into two or more groups participate. The program may include starting a game part game content featuring the two or more groups, and a plurality of areas in a virtual space. When no area exists that does not belong to a first group on a route from an area belonging to the first group to a specific area belonging to the first group, a first parameter of a first game medium, which may be located on the area and may belong to the first group, may be changed. If another area belonging to the first group and having a second state different from a first state exists on the route, the first parameter of the first game medium may change less or not at all.