A day in the life of a Game Designer
Create Your Game - 
        The Gameplay
        How difficult should the game be? Do you want people to get to the end or make it virtually impossible? This is a key component to addictiveness – make it too hard and they will get frustrated and quit, make it too easy and the game no longer holds interest.
We are going to have 3 levels in our game, how should these vary? More questions each time, different categories? How many right answers should we include (accuracy)?
Take your time to play around with this, making sure you balance the game challenge with how long it lasts.