Ghost of Tsushima runs incredibly well on the Steam Deck, but to my surprise, Valve has rated it as Unsupported. The game's handheld performance is arguably the best of any PS5 port so far, so why would Valve not give it, at the very least, a Playable rating? Well, there's one small issue preventing the game from getting a better rating, and I can't help but feel like Valve is making a huge mistake with how it is handling this situation. I've tested Ghost of Tsushima on the Steam Deck OLED and the performance is fantastic. You can see exactly what settings I'm using in our Steam Deck compatibility guide. Valve's decision to slap the game with an Unsupported rating, then, is down to one game mode not working because it needs to access PlayStation network features, which right now is only possible on Windows devices. Continue reading Valve is making a huge mistake with Ghost of Tsushima on Steam Deck MORE FROM PCGAMESN: Best free Steam games, When is the next Steam sale?, The best Steam Deck games