By May 31st, publishers must opt-in to GeForce NOW for their games to be offered by the service, Nvidia announced today. According to Nvidia, over 200 publishers have chosen to opt-in thus far. Publishers who do not opt to include their games in the service by May 31st will have their games removed from GeForce NOW. Over 2,000 games are currently available. You can find a full list here.
You can read more about GeForce NOW in our preview from October.