Sticks and giant hockey players may break some bones, sure, but chainswords will rip flesh asunder. Today's high-profile and violent demo additions to the Xbox Live marketplace include hockey simulator NHL 12 and bulked-up shooter Warhammer 40K: Space Marine.

Don't forget, if you play the competently created downloadable game, Warhammer 40K: Kill Team, you'll unlock the "Power Sword" when Space Marine starts its orbital assault on September 6.