I think the problem, other than not enough hosts/players, is that people are playing mainly 20 minute games now, but the lobby only has to remain open for a couple of minutes. It's EASY to miss a room.
What would be nice is to have on top a list of games still in the lobby, but below that a list of games that are currently being played and the remaining time on them. Even though the room doesn't remain open, you'd know that most likely a room is going to re-open a few seconds after that timer runs out.
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