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The Crystal Crawler is a large LEGO Power Miners combiner set vehicle that can be constructed using the parts of 8959 Claw Digger and 8961 Crystal Sweeper. Instructions for this are available from the official LEGO website.
The Crystal Crawler has treads in the front and large spiky wheels at the rear. It has seats for two minifigures, a movable loader in the front and an extendable loading bin at the rear.