What are some fun free iphone apps?

We're taking our semester test and after we get finish with the test; we got about 3 hours in study hall and it is really boring in there, so please tell me a fun app that will get me through the day

Turtle slide is fun

Some free apps that I enjoy are:
-Car town
-Stupid Zombie 1 & 2
-Streaker
-Scramble with friends
-Badly Drawn
-Draw Something
-CSR Racing
-Airport Scanner

Those are a few of my favorite free games. You can also look for free games in the App store by looking in the "Games" category and selecting free games or you can find more by searching for the top free games on YouTube

Dead trigger
Temple run
Indestructo tank
Hill climb

Here are some free fun apps for iPhone to keep you entertained:

RhinoBall - http://www.appfavour.com/games/rhinoball_294531474/
TapDefense - http://www.appfavour.com/games/tapdefense_297558390/
Mouse About lite - http://www.appfavour.com/games/mouse-about-lite_294225028/
Blue Skies Lite - http://www.appfavour.com/games/blue-skies-lite_290823716/

Have fun!