3. World of Warcraft The World of Warcraft series is only for the PC. It was developed by Blizzard Entertainment. It mostly got a 9 out of 10. More than 10,000,000 people play the game. It is rated T for Teen.

5. Left 4 Dead Left 4 Dead was developed by Valve Corporation and Certain Affinity. Left 4 Dead is for PC and Xbox 360. It is rated M for Mature. It mostly got a 9 out of 10. Left 4 Dead has won many awards.

7. Rockband There are two Rockbands out: Rockband 1 and Rockband 2. Its developer is Hamonix Music Systems. You play the game with a guitar, bass drums, or/and a microphone. Over 7 million copies of Rockband titles have been sold and over 30 million songs. It is rated T for Teen.

9. Guitar Hero There are 4 games that are out in the Guitar Hero series. Guitar Hero, Guitar II, Guitar Hero III, and Guitar Hero: World Tour. Its developers are Hamonix and Neversoft. You play the game with a guitar, a bass, drums, and a microphone. The series has sold over 23 million units, earning over $1.6 billion at retail. It is rated T for Teen.

11. Assassins Creed Assassins Creed is rated M for Mature. Its developer is Ubisoft Montreal. It is for the PS3, Xbox 360, Nintendo DS, and PC. It mostly got a rating of 9.5 out of 10. It won the Best Action/Adventure Game of the Year Award. Besides that award, it has won many others.

13. Gears of War Gears of War has two games out : Gears of War 1 and Gears of War 2. Its developers are Epic Games and People Can Fly (Pc version). It is for Xbox 360 and PC. Gears is rated M for Mature. It mostly got a 9.3 out of 10.

15. Army of Two Army of Two was developed by EA Montreal. It is rated M for Mature. Army of Two is for PS3 and Xbox 360. It mostly got a 9 out of 10. In the game you can customize your guns in many different ways.

17. Call of Duty The Call of Duty series has five games out for it : Call of Duty, Call of Duty 2, Call of Duty 3, Call of Duty 4, and Call of Duty: World at war. Its developers are Infinity Ward and Aspyr (Mac conversion). They games are rated T for Teen and M for Mature. COD is for Xbox 360, Xbox, PC, PS2, PS3. It mostly got a 9.5 out of 10.

19. Halo The Halo series has four games out: Halo 1, Halo 2, Halo 3, and Halo Wars. Halo’s developer is Bungie. It is only for the Xbox, Xbox 360, and the PC. The Halo series is rated M for Mature. It mostly got a 9.5 out of 10. As of January 3, 2008, Halo 3 has sold 8.1 million copies. Halo 3 was the best- selling game of 2007.

21. Elder Scrolls IV: Oblivion Oblivion’s developer is Bethesda Softworks. It is rated M for Mature. It is for Xbox 360, PS3, and PC. It mostly got a 9.5 out of 10. Oblivion has won many awards. The graphics for Oblivion are the best that I have ever seen!