Devil May Cry 4

At the beginning of level 9 when you fight Alto Angelo wait until he summon the black ball. Quickly charge shot it and you will get an instant SSS rank. Every Alto can do this attack one time. The resulting explosion hurts and kills the other knights as well. Thanks to this trick you will also unlock "Smokin' Style!!" and "Smokin' Sick Style!!!" achievement :)

Play in automatic mode and slash away the enemies with the mix of Sword, Pistol and Grasp. It's really easy in auto mode on.