With this step, Google aims to break into the global video game industry expected to top USD 150 billion this year, with cloud technology that could broaden audiences attracted by rich new features as well as ease of access with no more need for consoles.
Google will have to fight the cloud gaming major PlayStation Now in an emerging and highly-competitive market.
In Oct, Google sold out of "Founder's Edition" kits, which are priced at USD 129. Each kit contains a Stadia controller and a pendant-shaped Chromecast Ultra wireless connection device that plugs into television sets.
Stadia games are playable using Google Chrome web browser software on computers. It also works with Google-made Pixel smartphones from the second-generation onward, and on televisions.
Stadia Pro subscriptions, priced at USD 10 a month in the US, will be available in 14 countries in North America and Europe.