When the Times first started publishing them about a month ago, they rated the difficulty levels as Gentle, Moderate, Tough, and Diabolical, with the difficulty level increasing to Diabolical by the end of the week. I haven't seen one rated Diabolical since that first week (they must have realized that would scare everyone away). Now they print mostly Gentle and Moderate level. But the weird thing is, sometimes I've found a so-called Tough puzzle easier to deal with than a Gentle.
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