The "World Engine 4.0.0 APK" is essentially the fantasy of turning Lunar Magic into a touch-screen app. It is the desire to carry a ROM hack in your pocket without emulation.
Is this the holy grail of mobile Mario, or just a cleverly baited trap?
And that is the cruel irony: But because those require finding .sfc files and patching them, the lazy gamer dreams of a single "4.0.0 APK" that does everything. The Verdict: Should you search for it? Creatively: Yes. The idea of a mobile Mario Maker with the World engine is a masterpiece of fan desire. It forces us to ask why Nintendo hasn't made this yet (the answer is always control and monetization).