Two players, one phone — sit at opposite ends. You each get a circle of eight objects, and exactly one object is in BOTH circles. Spot it and tap it first to score a point. Tap the wrong one and your rival scores instead. First to 10 wins.
Blue wins!
10 · 7
Two players, one device, and the strangest little puzzle on the site. You each get a circle of eight objects, and between any two circles there is always exactly one object in common — never none, never two. Spot it and tap it before the other person does. It works because of a piece of geometry rather than luck, which is why the shared object is often the one you have already looked straight past: the size and angle change between the circles, so your eye keeps sliding off it. First to ten points wins.
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