Yes you can. in the lobby, go to settings located in the top right corner, scroll down, you will see blood effects. click off and press ok.
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In halo combat evolved you can go to settings and turn decals off and there will be no blood (except blood from the convenant which is blue and purple)
In halo One Combat Evolved Or any other halo games for pc,options are available to turn off images of blood and gore.
gondonsys.net has one but you need to be invited or wait till they have free sign up
No, you can't turn off the blood in Tomb Raider.
No. If you turn off the blood in Dead Island, Then you will loose a life.