Why include the 'game of questions' in a movie about existence?

Rosecrans's and Guildernstren are lost in a world where they seem to have no memories other than being sent on a mission. Now they are asking questions to find there existence. Could there life be to ask questions. There mission is to find out whats wrong with Hamlet and why he is mad. They are surely not going to get any info if they don't ask question and thus there sponginess of life is meaningless if they don't ask questions. So there existence must be to ask questions but they don't know what questions to ask.