Royal Gem is a free and easy-to-play game. Its main goal is to merge two identical gems together to form a higher-level gem. 

This is done by simply tapping, dropping, and merging the gems together. As you play, you will gain experience and level up. Each time you gain experience, you will get a gem of the same level. So, the more times you play, the more gems you will get.

In order to gain experience, you will need to drop the number of gems that you have in your hand. The more you drop, the more experience you get. You can play at your own pace, there is no time limit.