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Enigmas and puzzles

By Ian Stewart   January 2008

Colorado Smith and Brunnhilde had battled their way past the pit of giant anacondas, the lake of liquid lava and the tunnel of the flesh-eating piranhabats. Now they faced the final obstacle before the fabulous treasure cave of the lost Inca princesses.

Three stone pillars rose from the ground to the height of a man’s shoulders. Beside them was a pile of thick circular slabs. Smith peered at his father’s tattered notebook. “To pass the pillars and enter the cave, place the correct number of slabs on each pillar. The pillars will sink into the ground. But beware, any error…

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