
Yellow rule or blue rule?
Diamond grids are tagged yellow or blue, each colour standing for one of two rules. Work the two rules out from the tagged examples, then decide whether a new grid is yellow or blue. A correct pick flashes green, a wrong one red.
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Diamond-shaped grids are tagged either yellow or blue, each colour standing for one of two hidden rules. You work both rules out from the tagged examples, then decide which colour a new grid belongs to. Right answers flash green, wrong ones red.
Two rules rather than one is what makes it hard: you cannot simply find a pattern, you have to find the boundary between two of them. It is a visual task, so it is described here rather than written out — a static rendering of a grid classification is not a sample of it.
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