END-GAME CHALLENGE MODE [SOLO OR 2-PLAYER] After completing Sons of Sparta's main story, you will unlock a challenge mode that can be played solo or with local 2-player couch co-op. HOW TO UNLOCK Complete the main story quest of God of War Sons of Sparta. LOCAL 2-PLAYER COUCH CO-OP This mode is entirely offline; a persistent internet connection is not required to access it.