 <translate> The relevant sentence in the passage is: The IW engine is a game engine developed by Infinity Ward, Treyarch, and Sledgehammer Games for the Call of Duty series. Therefore, the final answer is The IW engine. <yor> Ọ̀rọ̀ tí ó wà nínú àyọkà náà ni: Ẹ̀rọ IW jẹ́ ẹ̀rọ eré tí Infinity Ward, Treyarch, àti Sledgehammer Games ṣe fún Call of Duty series. Nítorí náà, ìdáhùn tó gbẹ̀yìn ni Ẹ̀rọ IW. 