Now thanks to https://f-droid.org/es/packages/rs.ruffle/ (it has high % compatibility but it is ok) another we have again a handful flash games in the phone.
There was an official plugin by Adobe on Android but it was awful, I remember watching them showcase it at a conference it was tragic even with their handpicked and simple example.
Then there was a transpiler that produced native apps from Flash, this was actually pretty good but Apple then banned transpiling which killed its viability entirely, six months later they un-banned transpiling but the damage was done.
But on the plus side, Apple got to monopolize transaction fees in Flash games like Farmville for nearly two decades!