It WAS a nintendo advertisement. They financed it. Doesn't make it any less of a good movie.
Same thing with Willie Wonka and the Chocolate factory (the original) - it was financed by the Wonka candy company (as per the audio commentary track on the dvd release).
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By simply doing what they are designed to do something large and magnificient happens. In this sense they show us how to live; The only barometer you have is your heart. When you spot your flower, you can't let anything get in your way. - John Laroche