Buy 1 of these
http://www.ebay.ie/itm/Retro-Super-Nintendo-SNES-USB-Controller-Jopypads-for-Win-PC-MAC-Gamepads-HT-/201493788901?hash=item2ee9f738e5:g:3XoAAOSw~otWg6UG
Then 1 of these
http://www.ebay.ie/itm/Micro-USB-to-USB-2-0-Converter-U-Disk-OTG-Adapter-For-Android-Phone-Tablet-/391415399777?hash=item5b222d0561:g:-7AAAOSw37tV-jbG
And away you go.
Considering how cheaply you can get a Classic Nintendo controller for use with smartphone games I really think there isn't going to be a massive amount of money earned from Nintendo doing this, unless they want to take legal action to everyone selling these type of controllers that are already on the market.
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