The codes at the end of each level (18 30, 88 17 and 37 W) are actually map coordinates that point to a specific location in the Yucatan peninsula where (according to the Sunrise Software press information) the Quintano Roo Treasure Chest was buried. It was part of a scholarship contest that was never held.
Screenshots (2)
Quest for Quintana Roo — screenshot 1Quest for Quintana Roo — screenshot 2