 "Soulcalibur IV" introduces new gameplay mechanics into the series in the form of damage-absorbing armor (that can be shattered) and Critical Finishes (both tied to the new Soul Gauge).Like "Soulcalibur II", the fourth game also included cameos from different media.The "Star Wars" character Darth Vader is an exclusive playable character on the PlayStation 3, while Yoda is exclusive to the Xbox 360.