@raybirks yeah it is possible, but it doesn’t “just work” using the multiplayer blocks. you need to write your game specifically to handle all of the communication over the jacdac cable.
i wrote a sample game a long time ago but it doesn’t work anymore because the underlying APIs have all changed. someone also made an extension based on my game here but i think that extension also no longer works for the same reason. i’d love to dust all of this stuff off, but i’m afraid i don’t have time at the moment.