Based on App Annie Index, here are Top iOS Game Apps Worldwide in December, 2014.

iOS Games Worldwide by Downloads

1 Trivia Crack

2 Candy Crush Soda Saga

3 Crossy Road

4 Looney Tunes Dash!

5 Fun Run 2

6 My Talking Angela

7 SimCity BuildIt

8 Candy Crush Saga

9 Dumb Ways to Die 2

10 Amazing Ninja

iOS Games Worldwide By Revenue

1 Clash of Clans

2 Puzzle & Dragons (パズル＆ドラゴンズ)

3 Monster Strike (モンスターストライク)

4 Candy Crush Saga

5 Game of War - Fire Age

6 Candy Crush Soda Saga

7 Hay Day

8 Disney Tsum Tsum (ディズニー ツムツム)

9 Boom Beach

10 Farm Heroes Saga