There are 3 types of games:
There are 2 basic modes for the games:
You have 60 seconds  to reach the maximum number of matches between the origin  and one of the elements in the matrix . To pass game the number of matches  must be above 15.
To get a bronze medal your score must be 15 hits, 18 for silver medal, and 20 for gold medal.
Radicals and HSK games are progressive, that means you need to pass a game to unlock the next one.
To change it you must be logged in. Then, under "My Account" you can choose the origin (mother) language to learn Chinese. You can select English, Spanish, German and French as your mother language.
You can get the words used for each game in PDF format under "Resources" section.
The color of your belt depends on your completed HSK games.