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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 3: BFE

Serious Sam 3: BFE

First Person Shooter

Serious Sam 3: BFE is a glorious throwback to the golden age of first-person shooters where men were men, cover was for amateurs and pulling the trigger...

Serious Sam 4

Serious Sam 4

First Person Shooter

Serious Sam 4 reignites the classic FPS series in a high-powered prequel loaded with an explosive arsenal, intergalactic carnage, and perfectly timed...

The Talos Principle

The Talos Principle

Puzzle

As if awakening from a deep sleep, you find yourself in a strange, contradictory world of ancient ruins and advanced technology. Tasked by your creator...