How do you unlock challenge mode
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To unlock chalenge mode you have to beat the game. After you beat otto, the game is over and they give you the option to either go to the point before you kill him or start the game over with all your weapons, bols, and most gadgets. Chalenge mode is the mode when playing the game for the seconed time with everything. You can also buy new weapons and upgrade to titan weapons. Hope I helped
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