The objective in this tile matching game is to collect all of the sparkling gems in a level before the time runs out on the ticking pocket watch. The number needed for the level is displayed above the main grid. Swap one stone at a time by choosing a pair, which trade places with a click, slowly eliminating all those which contain gemstones. The entire board can be shuffled twice and hints can be purchased for the cost of points. There are also timed mini-games sprinkled throughout the game which provide more opportunities to earn gold stars.
The location is Cancun, Mexico, in 1935 where young Dr. Emily Jones is working at the Archaeological Museum. The discovery of an ancient stone tablet in the museum sparks her interest. She ultimately concludes that solving tile-matching puzzles will lead her to a secret Aztec city. Emily's journal acts as a record of her findings, and newspaper articles and other documents keep the story moving along at a preset pace.