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Settled on RetroArch which can be downloaded right from Google Store.
Read through an introduction.
Load RetroArch. The keys are B to go back and A as enter keys.
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Then installed core Arcade (Mame)
Downloaded ROM and upload via your computer to,
by transfering to (create the bolded folders) via my Mac,
RetroArch/system/mame/roms/Wonder Boy in Monsterland/wbmlb.zip
Then on RetroArch this maps to,
storage/emulated/0/RetroArch/system/mame/roms/Wonder Boy in Monsterland/wbmlb.zip
Reference Video
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