Copy your legally owned Serious Sam 2 game folder (from Steam or GOG) to your phone's internal storage.
Since Serious Sam 2 was originally released for Windows and Xbox, the most reliable way to play it on modern Android devices is using a Windows emulator like or Mobox .
While there is no official mobile version of (the 2005 sequel) developed by Croteam, the game can still be played on Android through specialized Windows emulators or fan-made source ports for the earlier "Classic" titles. 1. Playing Serious Sam 2 via Windows Emulation
Create a folder named SeriousSam on your device's root directory.
Many websites claim to offer a "Serious Sam 2 Android APK," but these are often misleading or contain malware. Genuine gameplay requires you to provide your own PC game files.