Slot themes have become surprisingly varied over the years. Some games are built around mythology, ancient civilizations, treasure hunting, or fantasy worlds, while others use food, music, animals, or seasonal events as their main idea. I tend to notice the visual style first because it can tell you quite a bit about the mood of the game. After that, I look at the symbols and bonus features to see whether the gameplay matches the theme. It’s also interesting how two games with completely different artwork can have similar mechanics underneath.