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Ist da wer?! is a hide-and-seek game in which attentive children need to recognize what cannot be seen. The centerpiece of the game is a "thicket", that is, a large vertical container that represents a bunch of bushes. Inside this container are twenty wooden discs, two each of ten colors, and you can see these discs inside the thicket through 29 cut-out slots. However, the thicket is designed so that five of the discs will fall into grooves at the bottom of the vertical container, and the discs