I Hate Running Backwards (2018, PC/Switch/Xbox One/PS4, developed by Binx Interactive).Serious Sam's Bogus Detour (2017, developed by CrackShell), another top-down shooter.Serious Sam VR: The Last Hope (2017, PC), a VR first-person wave shooter.
Serious Sam: The Greek Encounter (2012), which reimagines Serious Sam as a top-down Shoot 'em Up.
Serious Sam: The Random Encounter (2011, PC, developed by Vlambeer), which reimagines Serious Sam as a Role-Playing Game.
Serious Sam Kamikaze Attack! (2011, PC/iOS/Android, developed by Be-Rad Entertainment), a Perspective Flip where you control a Headless Kamikaze trying to kill Sam.
Serious Sam Double D XXL (2013, X360/XBLA, developed by Mommy's Best Games).
Serious Sam Double D (2011, PC/X360, developed by Mommy's Best Games), which reimagines Serious Sam as an Abuse-like 2D side-scrolling Shoot 'em Up.
Serious Sam Advance (2004, GBA, developed by Climax London).
Serious Sam: Next Encounter (2004, PS2/GC, developed by Climax Solent).
Serious Sam VR: The Second Encounter (2017).
Serious Sam HD: The Second Encounter (2010).
Serious Sam: The Second Encounter (2002).
Serious Sam VR: The First Encounter (2017).
Serious Sam HD: The First Encounter (2009).
Serious Sam: The First Encounter (2001, PC/Palm OS/Xbox).