Unlock Extra Difficulties
Complete the following Campaign modes as host to unlock the corresponding difficulty setting. It is possible to join open games of higher difficulties providing you are in the hosts set level range. You will not however be able to play those difficulties yourself as host until the requirements for that setting have been achieved. Note: the Bronze difficulty setting unlocks nothing.
Unlock Gold Difficulty:
Complete any Silver Campaign as host.
Unlock Platinum Difficulty:
Complete any Gold Campaign as host.
Unlock Niob Difficulty:
Complete any Platinum Campaign as host.
Added by: Sanzano Jun 24th 2009, ID#4618