 With the exception of Ascension , each installment offers a challenge mode , which yields extra red orbs , secret costumes , and behind @-@ the @-@ scenes videos . Bonus content can also be unlocked by defeating the game 's difficulty levels . Battle arenas , which allow players to set difficulty levels and choose their own opponents , are included in God of War II , Betrayal , God of War III , and Ghost of Sparta . A quick @-@ time sex mini @-@ game is also included in each installment except Betrayal and Ascension . 
