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Whoever manages to get the mistery shape in the least amount of guesses wins! It`s good to choose a shape that there are lots of - like a triangle, because there are a few and it will use up the guesses of the person who is trying to find the correct shape. If you ask a good question that removes ?' you can remove lots of cards and it gets you closer to the correct shape or angle. Observe the cards set on the table and think about the different questions that could illiminate as many cards as possible, such as 'does this shape have four or less sides?', because this can get rid of lots of cards:squares, rectangles, circles and triangles.
When you are down to a few cards left think about a question that relates to most of the cards turned up, so it leaves you with only very few so you can easily guess the right card. Listen carfully to all questions asked so that you can relate to the cards left turned up and iluminate any uneeded cards, also so you don`t repeat a question and waste your 12 guesses.