Most games treat 100% completion as its own reward. You did the thing, here's a number, goodbye. The worst offenders (looking at you, Yoshi's New Island) give you nothing, or maybe just an achievement that pops on your screen for three seconds and then disappears forever. The slightly better ones give you a cosmetic nobody asked for. And then there are games on this list which understand that players willing to go the distance deserve something more elaborate in return.
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