Croteam surprised us today as it released the source code of the Serious Engine v1.10 for free to everyone. This engine was used to create both Serious Sam Classic: The First Encounter and The Second Encounter.
As Croteam noted:
“Serious Engine v1.10 is very well commented, easy to modify, and there are lots of user generated mods out there. This version has everything you need to build your own game – or just experiment.”
Those interested can download the source code for the Serious Engine v1.10 from here.