sentences:  The challenge mode in this game is called the Challenge of Olympus (seven trials) and is unlocked after the game's completion.This mode requires players to complete a series of specific tasks—for example, killing all enemies without weapons in a limited amount of time.The player may unlock additional rewards, such as bonus costumes for Kratos, behind-the-scenes videos, and concept art of the characters and environments, by completing the game's difficulty levels and challenge mode.