Steam Deck is the new Valve hardware that will play your Steam library on the go using Linux and a modified version of Wine. Because of that some games don't run perfectly and Valve has a new system to let you know what games work and what games might need some tweaking.
"Introducing Deck Verified: See at a glance how your Steam games run on Deck. "
"Introducing Deck Verified: See at a glance how your Steam games run on Deck. "