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[luke2135]

Didn't find any appropriate topic so I post it here.
I usually play on gold and sometimes on silver difficulty. After the tenth wave the game raises my bronze difficulty challange counter. Happens on Firebase Ghost most of the time.

[Klokos]

If you complete a map related challenge on gold it counts Toward silver and bronze completion as well, if you do it on Platinum it count towar gold, silver and bronze too.