You shouldn't change the difficulty setting on someone else's game.
Jimmy tells Joe that Joe can play games on Jimmy's computer while Jimmy gets chores done.
Joe wants to play challenging games.
Joe makes sure he undoes any changes to game settings before closing the game.
Joe opens the settings to several games and changes the difficulties until he finds one that is challenging enough.
Jimmy feels respected and tells everyone that Joe can be trusted.
When Jimmy tries to play games he discovers the tampering and loses respect for Joe.