Can I use games that I already have on Google Stadia?

I bought Red Dead Redemption 2 and want to play it on Stadia now, but it costs something.

Can I somehow play my game there without buying it there?

No you can't. You have to buy ALL the games you want to play on Stadia NEW, or with a Stadia subscription you will receive games for free, which can then only be played with a Stadia subscription.

And if I buy it there, can I use my online game save there?

That is why the expert recommends Geforce Now. You can link this to your Steam or Epic account and use the games available there.

However, not all games are supported there, e.g. Nothing from Capcom (Resident Evil, Dead Rising).

No, you can't either. The game is not crossplay capable.

Which, in turn, does not help if you only have a Chromecast, for example.

Oops, wrong, sorry.

According to the Geforce Now Forum, this can also be done via Chromecast, but can't judge it yourself.

There's no Rdr 2 there, that's my point. I already use GeForce Now, but I'm interested in this game

It's a shame, then I'll cancel my subscription.

Ok, that's stupid.

Just a quick question, do you think it could be Rdr2 for GeForce Now coming out soon?

The game will definitely come. But I can't tell you whether it will be soon.