GAME DEVICE, GAME SYSTEM, METHOD OF CONTROLLING A GAME DEVICE, PROGRAM, AND INFORMATION STORAGE MEDIUM

摘要

First part executing means (72) of a game system (1) changes a game difficulty level in a first part, where a player plays, by changing a first game parameter in the case where another player has performed a supportive operation or an obstructive operation. Second part executing means (74) changes a game difficulty level in a second part, where the other player plays, by changing a second game parameter based on the result of play that is played by the other player in the first part with the first game parameter changed.