Wednesday's AMA confirmed that you will need to use Chromecast Ultra included with the founder's first day release. Pairing the Stadium controller this evening seems to be already available on existing streaming tunes.
According to Google this week, the full version of the Chromecast Ultra featured "the latest firmware" for playing Stadia. That said, the company hopes to update existing devices "soon after launch" to allow you to play on any connected TV.
It seems that it is already up to date with several Chromecast Ultra owners (via Reddit) with version 1.42.172094 – current stable – reporting that a Stadia Controller connection code appears on the screen. A pill-shaped bubble called "Stage Controller" is required followed by various key presses.
For those not using Stadium, the code can be disabled from the Google Home app under Ambient Mode settings. Until Stadia launches on Tuesday, it is unclear whether the game's streaming is already running with the current Ultras or whether another firmware update is needed.
Google this week fully details the on-screen process and application for the Stadium Controller connection:
If you already have a Stadia account on your Chromecast Ultra, use the Stadia controller to select the Stadia account you want to sign in with.
If you have not yet set up your Stadia account with Chromecast Ultra, continue with the rest of these steps.
Use your controller to select "+On the screen.
On your mobile device, tap your avatar in the top right corner of the Stadia app.
Tap Add Chromecast Account [your stadia account] Allow
Tap Done to complete the setup, or tap Add a security pin to add a needle to your Stadia account.
More about Google Stadia:
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