A standalone release refers to a product or piece of software being released or sold by itself, without any additional content or dependencies. It can work independently and does not need to be part of a package or bundle. Full definition
That's not all though, fans are also hopeful that Activision will also throw in another remaster of a classic Call of Duty game along with next year's standalone release for good measure. (fraghero.com)
PAX East 2018: Final Fantasy XV's Comrades Multiplayer Mode Will Get Standalone Release, New Update in 2018 (ign.com)
As we wade through this vast pool, we stumbled upon some classics that don't need any introductions (Super Mario 64), an arcade classic ported to NES (Double Dragon), the Sega Genesis» Donkey Kong Country (Vectorman), and an import Gradius game seeing its first standalone release in North America. (nintendoworldreport.com)