What's Serious Sam like in HD? Well, it's like Serious Sam. It plays exactly, and unapologetically, like the 2001 original. Croatian developers Croteam are confident that this, along with the engine's new jinglier bells and noisier whistles, is enough to tempt you to spend the best part of twenty quid. They also wouldn't mind if you forgot that the alternative is rooting around a second-hand bargain bin and picking up a dusty old copy of the eight-year-old original for fifty pence.