You need to complete a campaign mode to unlock the subsequent difficulty. There is NO LEVEL REQUIREMENT for these unlocked difficulties, contrary to the manual and other previous cheats listed here. Simply complete campaign to get access to it. Notes: Bronze unlocks nothing. You can join open games of higher difficulties providing you are in the hosts set level range and snatch the achievements that way, but this will not enable you to play those difficulties yourself as host until you fulfil the requirements below.
Unlockable How to Unlock Gold Difficulty Complete any Silver Campaign as host Niob Difficulty Complete any Platinum Campaign as host Platinum Difficulty Complete any Gold Campaign as host
Contributed By: Digital-Daemon.
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