You may recall that the creator of Terraria and Google were having a bit of a disagreement when the creator's personal Google account was disabled for unknown reasons.
That was recently resolved, and Terraria was put back on track to release on Google's cloud gaming platform. You will be able to purchase and play Terraria on Google Stadia starting tomorrow, March 18th.
Outside of those two games, it looks like Dragon Quest XI S: Echoes of an Elusive Age - Definitive Edition is available to play on Google Stadia as well. A significant win for any JRPG fan that was looking for something to play on Stadia!
Lastly, it looks like from March 16th until March 23rd at 9 AM PST, you will be able to play NBA 2K21 for free if you are a Stadia Pro subscriber. Log into your account and start shooting some hoops by yourself or online with friends!