Google enabled 4K streaming on Stadia in early March, the service originally launched with a 1080p cap. Now there is a middle step 1440p mode. If your hardware meets the requirements for 4K but your Internet cant quite handle it, then you should try 1440p. You will need a 1440p or 4K display and a Chromecast Ultra or Windows PC.
There are more games coming to Stadia too – Jotun: Valhalla Edition ($15), Sundered: Eldritch Edition ($20), MK11: Aftermath ($40 for the expansion, $60 for the Kollection) and The Crew 2: Hobbies ($50 for the base game, Hobbies is free) are all available today. The Elder Scrolls Online is coming on June 16 (free with Stadia Pro).
Also, you can now play PUBG Ranked Mode a different, more competitive set of rules for the game. This mode is available only to players using a controller (you definitely dont want to try this with touch controls, anyway).
Check out trailers for the new games below: