If you are looking for a dedicated APK (native port), fan developers have successfully ported the original games (The First and Second Encounter) to Android. These often run much better than emulated versions.

Users often need to apply community patches to the original PC files—such as mouse smoothing fixes or texture corrections—before running them through the emulator. Unofficial Fan Ports: Serious Sam: The First Encounter The Second Encounter (TSE) have dedicated fan ports available on platforms like SeriousSite.ru Serious Sam 2 lacks a direct native port because it uses the more complex Serious Engine 2 Gameplay Review (Mobile Context) Just completed serious sam on android,it was godamn fun

The installation process was a ritual of paranoia. He disabled Play Protect. He granted “Install from unknown sources.” The APK installed without a single error—a miracle in itself. Then came the critical step: moving the 1.2GB OBB file into Android/obb/com.croteam.serioussam2/ . He held his breath as the file transfer bar crawled to 100%.