Best Nintendo developed game ever

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Nintendo has made many great games over the years, but of all of them, which do you personally think is the single greatest game they have ever produced, and tell us what you love about it and why do you feel it deserves the top spot?

The rules:

• One nomination per person
• The nomination posts with the most likes/agrees will be picked as poll options
• Must be developed by Nintendo, not just published.
• Nintendo owned but non-EPD studios such as Retro and Monolith Soft are eligible
• For the purpose of this thread, independent partners such as HAL and Intelligent Systems aren't included
• Have fun!

Let the games (heh) begin!