A typical imitation Jewel Quest, which isn't necessarily a bad thing
Every stage (8 in all) has you matching gems according to color. For every set of three you match, a building block is raised up to workers on the top screen, who heave it away to add to the Wonder you're currently on. Match a set of four, and you get an explosive block that clears away an entire row of gems. The goal in each level is to not only match gems, but to do so over every square of the grid, until you've matched gems across the whole thing. Once all squares have been cleared, you must get a cornerstone gem piece to the bottom of the grid to finish the level.
In between stages, you can read historical information about the different wonders of the ancient world, which is a neat, albeit an afterthought.
I gave this game a 7.5 because it's not bad, its just nothing new. But again, if you like Bejeweled or especially Jewel Quest, you'll like this because it's essentially the same game.