In Spanish they may have symmetry; today’s grids in El País have a level two rotation, but I don’t know if they always use the same grid (they offer two difficulty levels, both of today’s have the same grid). The grid is more likely to be symmetrical for basic crucigramas (one letter per square, definitions on the side) than for those which have one syllable in each white square or in those that have the definitions written inside the black squares (which can be letter-per-square or syllable-per-square).
Note, I said “single word letters” not “single letter words”. I might be misremembering, but depending on where the black squares are I thought it was possible to have an answer in which the beginning or final letter does not appear in a crosswise answer.
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