Konstantin Nick (@sputn1ck) and I build lnplays.com for the Lighting Hackday in June 2018. You could play Pokémon via the Lightning Network build. Pressing the buttons of the GameBoy to move the player and to interact with the world would generate a lightning invoice. Paying that invoice would send the pressed button to the game-backend and the user could see the action over the live stream. The site not longer up, but parts of it can still be seen on archive.org.