What does "raise one's game" mean?
To "raise one's game" means to level up or improve one's quality of performance. The speaker used this expression to express his opinion that working with Chadwick Boseman forced other actors working with him to act even better. A similar expression is "up one's game." Ex: You have to up your game if you want to compete with him. Ex: Acting with Chadwick Boseman forced others to raise their game.