Ahah, the review section for LazyCat's MAME emulator is amazing: tons of people complaining it doesn't work and contain a virus.
It works without a glitch on two dozen phones and tablets I tested it with. People reporting virus are the same kind of lying idiots like your Gestapo friends on DDA and DF forums.
And of course it doesn't say where the code came from.
Install it and look at the credits, stupid.
https://play.google.com/store/apps/details?id=com.ctMAME