I am stumped trying to think of anything not invented yet
What do you need and why are you asking?
Don't worry about what hasn't been invented, look at what's out there and how to make it BETTER. What are some games YOU yourself play? How would YOU change them in order for you to play them for longer periods of time?
I have another question, does anyone know of any cheap books or websites that can help me learn either 3d type graphics or physics type gameplay, so basically that has examples of games you could make
What engine would you use for your game?