Well how do I get this coin ? I looked at the game credit website but I see no games. In the thread there links to games but the links are broke. So how exactly do you use game credit ? What game ?
Download the GShare app - there are games (steam keys) available for purchase there. In a few months, Unity integration will be in place so there will be many, many more games.
You can also download Pixel Wars and use GameCredits in there.