Knack review. Shop CGR shirts, hats, mugs & gear! Classic Game Room reviews KNACK, an action game and launch title for the PlayStation 4 showcasing all of the exciting things the PS4 can do (which includes crashing). Knack is whack! This launch title for the PlayStation 4 showcases Sony's least exciting exclusive character ever, Knack! Knack looks like something the dog threw up and plays like a generic PS2 action game from the bargain bin. Also it may crash your PS4 which requires the power cable to be pulled.