Serious Sam 4 gained a Steam Deck Verified rating recently, which is in part thanks to the developer pushing out a small but significant patch for the game. It was listed in the recent post on Steam Deck hitting 3,000 titles either Playable or Verified.
While it's not a Native Linux version like their previous titles, seeing another developer actively support their game in Proton to give a good experience on Linux and Steam Deck is great.
In the recent patch notes the developer stated: "Hey everyone! As you have noticed we released a small, but notable update for Serious Sam 4. The update is focused on performance and game stability, new GPU support and most importantly the game now has a Steam Deck support".
How does it run on Steam Deck though? Let's take a quick look:
In short: not great. Playable but frequent hard-drops down, even below 30FPS at times and the frame timing is messy. Seems they still have plenty of work to do on optimizing Serious Sam 4.