GAME CONTROL METHOD, SERVER DEVICE, GAME CONTROL PROGRAM, AND STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To activate an action, such as establishment of a friend relationship with other users.SOLUTION: When a processor 23 receives input for starting a rhythm game by operation of a user of a portable terminal, and input of user identification information for identifying the user, the processor 23 acquires information on the number of friend users related to the user identification information of which input is received from a memory 21. The processor 23 adjusts difficulty of the rhythm game according to the number of friend users indicated by the acquired information on the number of friend users.