2D Examples-
Rocket Knight Adventure- http://www.youtube.com/watch?v=EstCB5NbQGk
I pick this game because this is a very challenging game. I gives you a variety of different ways to damage foes and try to save your life, and as you progress thourgh the game it just gets harder.
3D Example-
Bioshock- http://www.youtube.com/watch?v=MCnsSiBqybc
Bioshock is my favorite game. It is a first-person shooter horror game. I like this game because it gives you a lot of random abilities and weapon to try and survive against splicers and big daddies and also endless way to combine attacks. I also like the old style setting and soundtracks. This is a truly beautiful created game that has very detailed surrounding.
Random-
Just Dance 3- http://www.youtube.com/watch?v=VevE4v065sA
The reason I chose this game is because it not really 3D or 2D but all the content mostly goes on outside of the screen. Yes you will look kind of funny and stupid but its a lot of fun to do the dances, especially as a party game. I love the idea of the kinect and that's the reason I got the game for the xbox (even though I am a playstation person). So because you didn't need a controller to play, I enjoyed playing this video game and got a new experience.