I'd say you have two approaches available:
- The REST API supports updating operations for users, so you could store data in a user profile field in Telligent.
- Build your own Widgets & widget Extensions to pull the data directly from your external game..
As for which option, to choose. The first option is the quicker & simpler of the two, but it is the less flexible in how you display the data. In your case I'd probably recommend the second approach - since your data is already stored in your external game, this method will avoid duplicating your game data between Telligent and your game