Steam Deck owners searching "can you play MARVEL Tōkon: Fighting Souls on Steam Deck" want a straight answer: the Steam page lists Windows 11 only — there is no native Linux build and no official Steam Deck Verified or Playable rating at launch. Here is the full picture.
Steam Deck runs SteamOS (Linux). Without a native Linux build, Tōkon would need to run through Valve's Proton compatibility layer. Online competitive fighters with server-side anti-cheat can be inconsistent under Proton, so treat Deck support as unproven until Valve publishes a rating.
Our recommendation: check the store page for a Deck compatibility panel before buying, and if you plan to compete online, a Windows PC is the safer choice. We will update this page the moment Valve publishes an official Steam Deck rating.