There are several people who’ve requested multiplayer, which I also think would be a really cool thing to have, but I’d love for multiplayer to work as it did on Nintendo DS.
If multiple DS’s where in the same physical location, one player could start a LAN game which the other devices could join even if they didn’t have the game.
I believe the way this worked was that each game defined a LAN-subset of the game, which not every game did, which was small enough to be quickly transferred to other devices. Once the game sessions was over, the game would be deleted from the non-owning consoles.
I think this would be a really cool feature for playdate, even in a completely online setting.
It would be completely optional to implement, and it would make it much easier to play games with your playdate-equiped friends. I even think it would be a good marketing trick, with the shared multiplayer acting as a sort of demo for the game proper.