Boy, did this one come out of nowhere. Shadow Complex, developed by the same team behind the current sensational iPhone game Infinity Blade, is another Metroidvania concept game that does the genre justice. Many have called it one of the best Xbox Live titles of all time, but consider its spot here at No. 20 a concession to those who thought the aiming system could've used a bit more refining. Still, this is one bad mamma jamma...and we share a last name!

FUN FACT: Cliff Bleszinski—a.k.a. Cliffy B of Gears of War fame—served as the design consultant at Epic Games for Shadow Complex.