Gex is a 2D platformer game, developed and published by Crystal Dynamics in march 1995 for the Panasonic 3DO and later for the Sega Saturn and PlayStation. Thanks to Gexthegecko we found out that in the final game it’s possible to reach an unused shooting level: it involves taking a certain route in Planet X (check the videos below). There’s also a test levels that include unused sprites from the 3DO version.
Beyond this, there are loads of concept artworks to unlock in the special ending (after the credits roll). It seems that the original plot never involved television and in the early prototype Gex was set in our world instead of its very own fantasy oriented one. There’s also an article with one of the game’s developers, which exposes even more pre-production goodness:
The game was about Gecko X, a Hollywood stuntman (stunt Gecko). The studio he worked for was in financial trouble and helping it fail were the enemies Karl Chameleon and his henchmen like Guido Gila. Each level would be themed around a Hollywood action movie genre. For example the Western. The level intro would show stock footage of old Hollywood western movies (for some reason marketing thought this was the greatest idea ever) and then the level would have Gex going through it doing “stunts”. The better he did the more money the ‘Movie’ made and therefore the better the studio did. One level was designed using that theme and it was just awful. […]
They wanted a 32bit game that would be the next Sonic but they were not willing to put the resources into it that would be required to do it. They had come from a 16 bit world and still thought they only needed a 16bit size team. […]
By June we had decided to get rid of Mode 2 and make each world have only one art set so for example the Horror world dropped the Haunted House art set and became just the graveyard. Done by that time were the graveyard art set, cartoon and sci-fi and almost no enemies. It was around that time that Silicon Knights (creators of Legacy of Kain) were asked to do some enemies for Gex. They cranked out about 26 enemies in about 1 month. Also Steve Suhy was hired and was asked to do many of the enemies.[…]
Since it was now June and the project was not even 50% finished, the company decided to cut the sci-fi levels since none had been done and since they didn’t like the art. That brought the game down to five worlds and they hoped would get the game done by Sept in time for Christmas. […]
Evan had programmed a shooter for his Senior project at Stanford (he was finishing his degree at Stanford and working on this nightmare project and competing in National gymnastics) and we decided to stick that shooter in the game as a bonus. […]
Gex 4 was in early development for the PS2, but it was soon cancelled and only few artworks remain to preserve its existence.
Thanks to Gexthegecko for the contribution!