From Outscape Wiki
Dark Orbs also known simply as 'orbs' can be purchased with real-world money and can be exchanged for certain things such as creating a Private Game. They cannot be used to gain in-game advantages and they cannot be exchanged for CryptaCoins.
Dark Orbs can be purchased from within the Outscape game or on the Outscape website.
For a list of things which can be purchased with Dark Orbs see: No Pay-to-Win Policy.