This app has been deleted or is hidden to the public. There is extremely limited to no information about this app.
We don't even have a name, hence why we are displaying SteamDB Unknown App "AppID".
If you see someone screenshot a page like this and add some information/images on it, it is most likely fake.
Every change is tracked in history, and can be directly linked to.
<iframe src="https://steamdb.info/embed/?appid=688640" height="389px" width="100%" scrolling="no" frameborder="0"></iframe>
Initializing graph of a week…
Initializing graph of a year…
|SubID||Name||Billing Type||Last Updated|
|197338||Steam Sub 197338||CD Key||July 28, 2017 – 14:41:36 UTC|
|197339||Steam Sub 197339||CD Key||July 28, 2017 – 14:41:36 UTC|
|197340||Steam Sub 197340||Store or CD Key||July 28, 2017 – 14:42:36 UTC|