So far I've beaten the game on like Heroic and two levels I think on Legendary...legendary is really worth it the game feels a lot different which is awesome. And as for skulls I've only found the one on Outskirts theres a few grenades piled on top of each other and a tiny scope on a tripod and a skull. It's close to the beginning of the level. Also I was able to get on top of almost all the rooftops on that level. Its awesome to explore and see all the detail that was put into the levels.
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