What's the single best game Nintendo has ever created?

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Having serenaded Mario Galaxy for several pages, I should note my runner up is BOTW. I've talked at length about this before, but it's the first game in years that really inspired my imagination with the almost endless gameplay potential made possible by its physics and chemistry systems, and the way such an elaborate system was woven together into such a cohesive, organic, and intuitive whole. 

Other honourable mentions from me go to Ocarina of Time, Galaxy 2, and Metroid Prime.