I've recently found them popping up everywhere, only I didn't know what they were. In my arrogance, I immediately started from the difficult level. I guess number games are easy for me, because the puzzle didn't last more than five minutes. So at a pinch, I'll play a puzzle and multitask something else at the same time.
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"La divina podestate, la somma sapienza e 'l primo amore."
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Editor/Moderator/Awesome Guy