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MercurySteam says they've become a better developer after working with Nintendo on Metroid: Samus Returns
Coming from a GamesIndustry interview with Enric Alvarez, MercurySteam...
"Nintendo is a one-of-a-kind publisher that make one-of-a-kind games. They're special. They are unique. They care about games. I am not exaggerating when I tell you that after two years, 80 or 90% of all the conversations we've had were about stuff that gamers care about. Only the remaining 10 or 20% were about business or usual publishing stuff. That ratio is unique to Nintendo. When you deal with them at a close distance, you understand why they are who they are. I'm not going to lie to you; they are extremely demanding. They require the very best constantly, all the time, and beyond. But it's been a great experience.
"We've worked in the past with other publishers, with Codemasters, with Konami, and they were very different experiences. We had a great experience with Konami, but Nintendo is another thing. There are many, many Nintendo fans who don't like any other games except for their games. Now I fully understand why that is.
"It has been a pleasure, we have learnt a lot. Honestly, they have made us a better developer."