No scouring the web for game files (although it does allow you to add local game files). Each platform has a large selection of games to choose from right within the app, and you can simply download the ones you want to play with a single tap.
The emulator is free with ad support however, you can remove ads for a one-time fee of $5. It also features the full Metal Slug collection if you're a fan of that game. Don't let the name fool you! Mupen64Plus FZ - Project64 isn't just a Nintendo 64 emulator it's a retro game center that lets you play NES, SNES, GBA, and N64 games.