What Verified means here
Valve's compatibility response resolves the game to category 3 (Verified) and passes default controls, controller glyphs, interface text, and default performance checks.
External-controller caveat
Valve also flags that an external Bluetooth or USB controller may need to be manually switched to the active primary controller. This matters when the Deck is docked for couch play.
Frequently asked questions
Is Machine Party Steam Deck Verified?
Yes. Valve's current compatibility result is Verified.
Do external controllers always work automatically?
Not always. Valve says the primary controller may need to be switched manually.