Croteam likely had to make a choice: compromise the "legion" scale of the battles to allow for split-screen performance, or keep the massive scale and cut split screen. They chose the latter, prioritizing the single-player spectacle and the "horde" identity of the game over local multiplayer features.
Before we dive into the technical setup, here is the quick verdict for each platform: is serious sam 4 split screen
If you are looking to play with others, you have two primary options: Croteam likely had to make a choice: compromise
This mod is finicky. It requires a high-end GPU (RTX 3070 or better for 2-player, 3080+ for 4-player) and often desyncs the audio. It is not for casual users. It requires a high-end GPU (RTX 3070 or
: You can play the full campaign with up to three friends, but everyone must have their own device and copy of the game. Deviation from Series Norms Serious Sam 3: BFE Serious Sam Classics , which offered robust local multiplayer, Serious Sam 4 lacks this feature entirely. Console Status