This may not be the best site for tips and advise on gaming but I'm sure i can help you with your questions and concerns on X-Box 360 consoles and games that i have listed. GTA 4, COD 4, Halo 3
Halo 3 a first person shooter. The game requires a amature skill level of play to be able to play well. 
Call of Duty 4 requires more skill than halo 3 because it is more realistic than halo 3 an therefor it is allot harder to succeed with out dieing.  
 
Grand theft auto 4 is a 1st person shooter action strategic free-roam game type. 
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