Games with officially released source code.ヘクセン - Japanese spelling (on the CD in the Japanese Sega Saturn release) The game also includes scripted sequences created with a language called ACS, allowing for much more complex puzzles and dramatic scenes. Other innovations in Hexen include weather effects, jumping, earth-quakes, and destructible objects such as trees and vases.

Many of the puzzles in Hexen require travel back and forth between different levels.

There are also portals between some of the 'spoke' levels. In Hexen's hub system each episode is still made up of interconnected levels, but most of the levels are connected to a single 'hub' level through portals. The hub system steps away from the traditional 'single levels stringed along into episodes' system which had been carried over into the FPS genre from sidescrollers and made popular by Wolfenstein 3D. Each one has four unique weapons and different levels of speed and armor. The characters are the Fighter, the Cleric, and the Mage. The new major changes this time around are three characters for the player to choose from and the level hub system. All of Heretic's innovations like vertical looking, flying, and the inventory system have been carried over.

Like Heretic, Hexen is a fantasy game based on an enhanced DOOM engine. Three humans have managed to escape with their lives and now seek vengeance against the Serpent Rider Korax who remains in their world. While the Heretic was destroying D'Sparil, the other two Serpent Riders have come to your dimension and slaughtered everyone.

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