Install from Google Store.
Select default folder for ROMs which which will translate over your network share to "internal/MAME4droid/roms"
Drop ROM file named as is which should look something like this (notice all lower case and zipped) - "wbmlb.zip"
You will now see WonderBoy show up as a listed game upon hitting the X key.
Fix Coin and Start Buttons on your Shield Controllers
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Reference

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