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In this section you will find our most difficult brain-teasers. If you are looking for a real challenge, or if you want to give a poisoned gift to one of your loved ones, then you are in the right section. We rated our puzzles on a scale (below). This is based, on the one hand, on the evaluation given by the manufacturers, and on the other hand, on our own feelings. This scale therefore gives you a good idea of the level of difficulty, however, depending on the individuals and their apprehension of the problem, the difficulty experienced may be different from the score assigned. Indeed, a brain-teaser rated difficult may seem simple, and a brain-teaser rated easy may seem very complicated even to people who are usually very gifted in this kind of exercise. It is really very complicated to assess the difficulty exhaustively, and even more so to compare them against each other. That said, in this section, rest assured, you shouldn't be too wrong if you want and are looking for a real challenge, or if you want to give a poisoned gift to one of your loved ones ...
♥ : No too difficult - ♥♥ : Difficult - ♥♥♥ : Very difficult