I'm down for hidden stuff, but one thing I don't care for is when there are challenges or missions like "find all the things". Think flags in Assassins Creed, Intel Items in COD, Cog Tags in Gears of War.
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Death cards from CoDWaW were the best. Paintball guns for the win
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I thought the cog tags from the first games were alright. But yeah. I'd rather have something like the skulls, few but hard to find with a good reward for finding them all.