Successfully complete the game with all levels 100% completed by not skipping over any levels when the storyline branches. The question marks at the main menu will then turn into the "Challenge" option.
Successfully complete the game to unlock Worlds 7 through 12, which are harder versions of Worlds 1 through 6.
Successfully complete World 12 to unlock Extra mode in the Forever Crossing mini-game.
Assassin's Creed III Preview
Dragon's Dogma
Ghost Recon
Borderlands 2
Epic Mickey 2: The Power of Two
Lost Planet 3
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