Its pretty Serious. Serious Engine 3.5 is the latest version of the Serious Engine. As it's name tells, it is based very closely on Serious Engine 3, but with enough drastic changes that it can be considered a mid-way point between Serious Engine 3 and a potential Serious Engine 4. it is only used in Serious Sam 3: BFE. As with Serious Engine 3, Serious Engine 3.5 cannot be licensed for use by other developers.

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Serious Sam TSE - STEAMIFY OFFICIAL PATCH - NO STEAM VERSION
Serious Sam: The First Encounter

Serious Sam TSE - STEAMIFY OFFICIAL PATCH - NO STEAM VERSION

Serious Sam: The First Encounter Patch

Latest official patch for retail Serious Sam TSE, includes fixes for compatibility under new OS and complete support for 16:9 resolutions. REQUIRED 1.07...

Serious Sam TFE - STEAMIFY OFFICIAL PATCH  - NO STEAM VERSION
Serious Sam: The First Encounter

Serious Sam TFE - STEAMIFY OFFICIAL PATCH - NO STEAM VERSION

Serious Sam: The First Encounter Patch 4 comments

Latest official patch for retail edition of Serious Sam, includes fixes for compatibility under new OS and complete support for 16:9 resolutions. REQUIRED...

HD remastered graphics
Serious Sam HD: The First Encounter

HD remastered graphics

Serious Sam HD: The First Encounter Full Version 1 comment

I improved the graphics of the mod, yes i added Ambient Light, PPX Bloom, HDR, Sharpen, Subsurface scattering, yes the best, of the mod, please test.

Teleporting sample
Serious Sam: The First Encounter

Teleporting sample

Serious Sam: The First Encounter Mapping Tool

Sample file for the tutorial on teleporting brushes

Multibattles example file
Serious Sam: The First Encounter

Multibattles example file

Serious Sam: The First Encounter Mapping Tool

This is the example file for the Multiple battles tutorial

Trigger Tutorial example file
Serious Sam: The First Encounter

Trigger Tutorial example file

Serious Sam: The First Encounter Mapping Tool

Example file for the trigger tutorial on moddb. Mirrored here for archival purposes

Terrain Samples
Serious Sam: The First Encounter

Terrain Samples

Serious Sam: The First Encounter Mapping Tool

This is the sample file for the terrain tutorial on moddb

Serious Editor Mathematics Toolkit v 1.0
Serious Sam: The First Encounter

Serious Editor Mathematics Toolkit v 1.0

Serious Sam: The First Encounter Mapping Tool

It´s a small tool for SEd equipped with the pythagoras function and and the ability to calculate angles from two sides of a triangle. If the user types...

Item-by-Item help/doc v0.41
Serious Sam: The First Encounter

Item-by-Item help/doc v0.41

Serious Sam: The First Encounter Mapping Tool

Item-by-Item help/doc HTML help file is a work-in-progress that attempts to document and discuss every feature of the Serious Editor for Serious Sam...

Serious Sam ++
Serious Sam: The First Encounter

Serious Sam ++

Serious Sam: The First Encounter Mapping Tool

This is a mod for the first person shooter game Serious Sam, designed to ease the work of mappers, by giving them more possibilites. If you've never designed...

The Penultimate Serious Sam Single Player Maps Building Guide
Serious Sam: The First Encounter

The Penultimate Serious Sam Single Player Maps Building Guide

Serious Sam: The First Encounter Mapping Tool

I see many people on the forums talking about how great single player maps are, and how they wanted to build one, but how they’re not going to build...

Serious Sam: TSE SDK v1.07
Serious Sam: The Second  Encounter

Serious Sam: TSE SDK v1.07

Serious Sam: The Second Encounter Source Code

This archive contains a portion of SeriousSam sources and some additional executables. The files included are intended to be used for game modification...

Serious Sam: TSE SDK v1.05
Serious Sam: The Second  Encounter

Serious Sam: TSE SDK v1.05

Serious Sam: The Second Encounter Source Code

This package contains the header files and libs to link with the engine and game, complete source of EntitiesMP.dll and GameMP.dll, debug version of game/tools...

Serious Sam: The Second Encounter
Serious Sam: The Second  Encounter

Serious Sam: The Second Encounter

Serious Sam: The Second Encounter Demo

This demo is designed to give everybody a glimpse of what's to come in The Second Encounter addition to the fast and fun FPS action title, Serious Sam...

Serious Sam: TSE Patch v1.07 Euro
Serious Sam: The Second  Encounter

Serious Sam: TSE Patch v1.07 Euro

Serious Sam: The Second Encounter Patch

European Version - This patches directly from version 1.05 to 1.07. To install, just click on the exe and it will find where and how to patch. 1.07 is...

Serious Sam: TSE Patch v1.07 USA
Serious Sam: The Second  Encounter

Serious Sam: TSE Patch v1.07 USA

Serious Sam: The Second Encounter Patch 1 comment

This patches directly from version 1.05 to 1.07. To install, just click on the exe and it will find where and how to patch. 1.07 is not net-game compatible...

Serious Sam SDK 1.05
Serious Sam: The First Encounter

Serious Sam SDK 1.05

Serious Sam: The First Encounter Source Code 1 comment

This package contains the header files and libs to link with the engine and game, complete source of Entities.dll and Game.dll, debug version of game/tools...

Serious Sam: TFE v1.05 patch Euro
Serious Sam: The First Encounter

Serious Sam: TFE v1.05 patch Euro

Serious Sam: The First Encounter Patch 3 comments

uropean Version - This patches directly from version 1.00 to 1.05. To install, just click on the exe and it will find where and how to patch. You don't...

Serious Sam: TFE v1.05 patch USA
Serious Sam: The First Encounter

Serious Sam: TFE v1.05 patch USA

Serious Sam: The First Encounter Patch 1 comment

This patches directly from version 1.00 to 1.05. To install, just click on the exe and it will find where and how to patch. You don't need to have any...

Serious Sam: The First Encounter Demo
Serious Sam: The First Encounter

Serious Sam: The First Encounter Demo

Serious Sam: The First Encounter Demo 1 comment

One of my favorite FPS games ever. This game is crazy, you go throughout a large set of levels based in Egypt facing an almost impossible amount of enemies...

Classic Serious Sam 2 Installer (pre-final b *fixed*)
Serious Sam 2

Classic Serious Sam 2 Installer (pre-final b *fixed*)

Serious Sam 2 Full Version 1 comment

Installs the mod, readme, latest changes and additional infos are included. It is important to read the text / instructions when selecting the installation-path...