I'd given some thought to this playtesting group, including how it had inadvertently stress-tested the lower limit of player number. Difficult as that was, because I do not like stress-testing, it wasn't the main thing on my mind. I was worried that the actual editor of the game and its interiors artist were still not quite in tune with how the game itself was played.
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This is always the toughest time for playtesters, because it's no longer about "cool, an idea," but about "oh crap, saying/teaching it this way is pure miscommunication." The poor players are like my hands which are trying to read Braille but are unfortunately picking up the waffle iron instead.
Here's the last session but one of the epic Cosmic Zap playtest, which sorta actually worked, and shows why successful playtesting has nothing to do with wowing people with your genius. Far from it.