Originally intended for the 32X under the codename Sonic Mars, Sonic X-treme was a Platform Game developed by Sega Technical Institute. Intended to be the franchise's big transition from 2D to 3D gameplay, the game began production in late 1994 before being unceremoniously cancelled in '97.
Following the release of Sonic 3 & Knuckles, series co-creator Yuji Naka and the Japanese staff at STI returned to Japan, while all the other members of Sonic Team remained in the U.S. While Naka and co. were off making NiGHTS into Dreams…, the Americans were assigned to make a new Sonic game.
What exactly the plot would entail changed a lot throughout development: It was originally conceived as taking place in the same continuity as the cult Sonic the Hedgehog (SatAM) cartoon on which the Archie comic book series was based, along with popular Canon Foreigners like Princess Sally and the Freedom Fighters, but Sega nixed that idea. (Sally and the gang had blink-and-you'll-miss-it cameos in Sonic Spinball in '93, along with characters from Adventures of Sonic the Hedgehog which ran parallel to Sat AM.) Other ideas ranged from Sonic battling demons who were sealed in the Master Emerald (a kernel of this idea made it into Sonic Adventure in '98) to him trying to make it to a hot date with Tiara Boobowski, a Manx cat whose status also varied in development. Many of these pitches involved playing as Tails and Knuckles, plus the new addition Tiara. But as the production shifted to the Saturn, it was agreed that Sonic should be the sole playable character in order to keep things simple.
Sonic X-treme was planned to have two gameplay modes. Standard levels would have a fisheye camera known as the "Reflex Lens" which made levels appear as though they were moving around Sonic. Levels would also rotate around a fixed center of gravity as though they were small planetoids, allowing Sonic to run up walls and ceilings. If this sounds familiar, some of those ideas were realized in Sonic Lost World 17 years later. Meanwhile, boss stages were free-roaming, with the boss fights themselves fixing the camera on an enemy in the middle of the arena, and Sonic running rings around them.
So what led to the game's cancellation? Basically, the dev team was split into two (Team A and Team B). One team, headed by Chris Senn and Ofer Alon, would concentrate on platforming stages and the other, headed by Christina Coffin, on boss stages. Team A's engine for the platforming stages ran great on computers, but struggled on the Saturn's hardware. To remedy this, an outside company, called Point of View, was brought in to help with the porting process, however their attempts at porting it were as bad, if not worse than Senn and Alon's. The latter finally managed to get it working decently on the Saturn, but when it became time for a check-in about the game's progress was held with CEO Hayao Nakayama in March '96, Point of View ended up demo'ing an extremely early and broken version to Nakayama, who demanded that all of their inferior work be scrapped and the entire game be done in the style of the boss stages. Despite Senn and Alon's attempts persuade him to look at their more finalized engine, Nakayama and other Sega executives were no longer listening. So the switch to the boss engine was made. And they wanted the game done by Christmas to compete with Super Mario 64.
Team B's attempts to make the Christmas deadline lead them to try and use code from the engine from NiGHTS to ease development, but one or more complications prevented this (there are conflicting reports as to the reasonnote ). The stress of having to complete a game from absolute scratch in only a few months made Christina Coffin contract pneumonia; she subsequently left the project and the game as a whole was cancelled. With no 3D Sonic to speak of, Sega decided to port over Sonic 3D: Flickies' Island (known in the West as Sonic 3D Blast) in its stead.
During the move to Coffin's boss engine, Senn and Alon were all but removed from development from the game, though they continued to work on their engine, hoping to pitch it as a PC game, but that also never got the green light, and so their work fell to the wayside. And, like Coffin, Senn also ended up contracting pneumonia, being told by his doctor that he had only six months left to live; thankfully, he survived. With both teams crippled and all three original programmers out of order, the game was finally, truly cancelled.
Sonic X-treme's failure to show up on shelves has been largely pointed to as one of the reasons why the Sega Saturn was a commercial failure outside Japan: the Saturn was already lacking entries in many of the prominent series that brought Sega success in Western regions, so the lack of a new mainline installment in their biggest franchise left the Saturn without the guaranteed Killer App. This wasn't helped by the fact that rivals Nintendo and Sony had brought to the table their own 3D platformer offerings for their respective consoles earlier that year. The Sonic series wouldn't receive a 3D installment until Sega got Sonic Team to revamp the series for the Sega Dreamcast. Meanwhile, the game's cancellation is blamed for why developer STI dissolved shortly afterwards.
Watch the 4worlds demo footage here and the hilariously ironic commercial here. For more detail on the game's development, see this three-part video series by YouTuber miiyouandmii2, as well as and Sonic Retro's comprehensive guide which includes information on characters, stories, scripts, and artwork.
In 2020, a few fans began Project SXU: an attempt to remake what was seen of X-Treme in the Unity game engine to finally make playable the Sonic game that never was. The first demo released August 2020, recreating two of the levels seen in the trailer. Additional information on this project can be found here.
As a sidenote, this game was at one point meant as a tie-in for a proposed live-action film called Sonic the Hedgehog: Wonders of the World. The plot of the movie would have involved Sonic and Robotnik escaping from Sonic X-treme into the real world. In addition, there was also a Christmas Episode for the animated show Adventures of Sonic the Hedgehog titled "An X-Tremely Sonic Christmas" in development to promote the new game as well. However, instead of being scrapped like the proposed live-action film, the Christmas episode was simply renamed "Sonic Christmas Blast" after the game's cancellation.
This game provides examples of:
- 2˝D: The game uses 2D sprites on a 3D plane. This element eventually came to a detriment of the title: the Saturn was designed for 2D games and Sonic X-treme was an early 3D platformer, however Mario 64 changed the whole paradigm. Sonic X-treme didn't look that technologically impressive when compared to its rival Mario or other 3D platformers. Attempts to fix this by making X-Treme more 3D failed. Also, when Tiara was still planned to be playable, her gameplay would've been the much more standard "character walks through 3D plain on a 2D rail.
- Always Over the Shoulder: When Tails was planned to be playable, his gameplay would've been over-the-shoulder throughout his levels.
- Attack of the 50-Foot Whatever:
- At one point in development, Nack the Weasel/Fang the Sniper was to be fought as a supersized boss.
- All the bosses were unusually sized in order to help gamers new to 3D games defeat them more easily.
- Competing Product Potshot: A live-action E3 promotional video features Mario and Luigi of Super Mario Bros. fame worrying about Sonic's next title. It even ends with the tagline "Mario Who?", implying gamers will forget all about Mario.
- Distaff Counterpart: Tiara was designed as being "Sonic, but female".
- Fish-Eye Lens: All non-boss stages would have used this effect in levels, making for disorienting gameplay footage.
- Fan Remake: One made for the SAGE 2020 expo. Likely the closest this game will ever be to properly being made.
- Furry Female Mane: Tiara was initially designed during the SatAM-based Sonic Mars stage of development and, as a result, she's styled similarly to female characters from the show. She had either loose, long hair or a ponytail depending on her design (with her later designs all using the Tomboyish Ponytail look).
- Gratuitous Princess: One story treatment had Tiara as the princess of a cyber world.
- Green Hill Zone: Jade Gully fit the series tradition of having the first level be a tropical level.
- Inside a Computer System: One draft of the story involved Princess Tiara and her father, King Cyberooski, being trapped in a virtual world.
- Make Way for the New Villains: Two story drafts would have had Robotnik usurped as the main villain by ChaosDoom and the Chaos Elementals.
- Promoted to Playable: If the game had gotten finished, it could have been Amy's first playable role in a main game. Plans for other playable characters besides Sonic existed, but it was decided to focus on Sonic until everything was perfected.
- Race Against the Clock: One of the many proposed plotlines for the game would've involved Sonic having to find the antidote to the Doomvirus, a deadly super-virus, which he himself has contracted. According to project head Chris Senn, there was to be a mechanic where the player needed to complete the game in a certain amount of time before Sonic succumbs to the illness.
- Slippy-Slidey Ice World: Crystal Frost is a zone that takes place on a snowy mountain.
- Top-Down View: When Knuckles was planned to be playable, his gameplay would've featured a top-down maze like Pac-Man, as shown here.