Your profile
What the games in the arcade have handed you, kept in one place. Each game counts its own things in its own words — nothing here is converted into anything else or added up into a score.
Nothing here yet — none of the games are reporting to your profile so far. Play them anyway: they keep their own records, streaks and bests on your device, exactly as they always have.
When the first game starts reporting, what you collect will begin gathering here. The arcade is this way.
Keep this profile
Right now this profile lives in this browser and nowhere else. Clearing your browsing data, or opening the arcade on a different device, starts a blank one — nothing is recoverable, because there is nothing yet that knows the two are you.
A name and a password fixes that, and keeps everything you have already collected. No email needed.