This is actually one I've been thinking a lot about. Certainly at the very least, I'll notify everyone involved at the end. If the second step doesn't come through, I'll send off the game-seed from round 1 to someone for the third round, too (and tell the original collaborator what happened). I'm also hoping to be able to reassign stuff if I learn in time that a collaborator drops out (and ask if early finishers have the time/energy to work on the dropped game) but of course that depends on hearing from the person who's dropping out!! Which I know won't always happen. Hopefully with timely reminders and posts though we'll get most of them.