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Absolutely not, they should stick to their own platforms. Number one, Nintendo get’s the importance of tight controls better than any other company. Excellent controls are one of the things that made Super Mario Bros. great. It eliminates "cheap" deaths, if you miss a jump it's your fault. You simply cannot accomplish the same tightness of control on a touch screen. Aside from that, Nintendo is based on two things - hardware and software. If they start publishing their IPs on other platforms, they lose the rationale for being a hardware manufacturer. With the exception of the Wii U, console sales have been a critical part of the company for many years. I know some people disagree with me, but a smartphone is a poor excuse for a gaming platform; the only type of games that really work well are time wasters and simple flash-style games.