You have to get Halo CE for the PC, and run the game in Dev mode.
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I have halo one and ther is no way to play as a grunt its just single player as mastercheif and then multiplayer as a spartan. Maybe you can in halo 2 or so forth or maybe there is some kind of mod but no, you can't play as a grunt.
a grunt from the halo series
it ether affects the gme to make it harder or it makes more fun like the grunt birtday party skull when you shoot a grunt in the head but all but two of the skulls make it harder so if you search this then you must like halo i would be suprised i you dont it is a great game if you want to know more then just ask me ok i know most there is to know about halo.
Yes.it's based during halo 1 so is halo wars.( but that wasn't really a halo game)
after Halo reach,there is no more In total, there is :Halo 1,Halo 2, Halo 3, Halo ODST, Halo wars and Halo reach