now by halo do you mean shooting or aliens and space ships and things like that. If its sci fi aspect your after you could give eve online or tabula rasa a try as far as i know they are the best sci fi games out there right now eve you fly around in ships has great graphics can do many things tabula rasa you dont get to fly in a ship that i know of only tried the trial but it is also a very interesting sci fi game. So if you dont mind paying then those are the games for you.
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now by halo do you mean shooting or aliens and space ships and things like that. If its sci fi aspect your after you could give eve online or tabula rasa a try as far as i know they are the best sci fi games out there right now eve you fly around in ships has great graphics can do many things tabula rasa you dont get to fly in a ship that i know of only tried the trial but it is also a very interesting sci fi game. So if you dont mind paying then those are the games for you.