The Zoombinis arrive at a stone face divided into four caves, which can be accessed by one path each. Each path is guarded by two stone guardians, who will only let Zoombinis pass if they have the right characteristics, similar to Allergic Cliffs. If the wrong cave is selected, a guardian will release a rock slide, sending the Zoombini tumbling down the path to the bottom. The player has many chances to find the right cave for each Zoombini before a rock slide tumbles down from above and seals the cave paths, leaving behind those who have not entered a cave.
Source: http://en.wikipedia.org/wiki/Zoombinis#Stone_Cold_Caves
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