Will I be able to play the games I own on the series X

Yes. The game will be backwards compatible with the Series X.

Yes! If you downloaded games on the S and bought the series X you can still play the games but obviously you have to sign into your microsoft account

-Dtub man the epic

if this helped please tick this answer

Okay but what if I sign in on my own Xbox Series X, will I be able to play my own games?

i believe it will most likely be able to be played on series x as all games previous to the series x are going to be playable onn it

Hi,

if it is a backward compatible 360 game (you'll find a list in the internet or just try it out) you can play it on your Series X.

The disc shows the system only that you own the game. It will then download a Series X compatible version of the 360 game.

As long as the disc is inside the console you'll be able to play it.