Abstract
Since Russia invaded Ukraine in 2022, information related to the invasion has increased. This information is spread through social networking services and TV programs. This study proposes a framework for a disinformation game system. In the game, a player spreads disinformation. In particular, we discuss topics related to the Russo–Ukrainian War in February 2022. The game system provides players with mental immunity to disinformation by simulating its spread. Three experiments were conducted in this game. In experiments on the proposed game, people gradually lost their resistance to disinformation by repeatedly receiving disinformation.