A non-transitory computer-readable medium includes computer program instructions, which when executed by an information processing system, cause the information processing system to: store a plurality of game media in association with each of a plurality of players, the game media each having a plurality of parameters; place a first of the plurality of game media in a predetermined area among areas of a field, based on an operation by a first player, in association with a state of first parameter indicating that a first parameter among the plurality of parameters is valid; and specify one or more specific areas in which is placed a second game medium associated with a different state of parameter indicating that a different parameter, other than the first parameter, is valid.