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some are harder than others
T+R is the hardest by far. all those elites with swords. they always kill the marines and leave u alone. and that damn captain keys is always trying to get him self killed some how.
Those sword bastards are tough! I once passed that part on legendary with one marine still alive...same odds as winning the lotto. The capt Keyes pathetic AI kept me from passing the level for quite some time.