Jurassic Park Trespasser: why the 1998 game failed

Jurassic Park: Trespasser came out for Windows in North America on October 27, 1998. DreamWorks Interactive developed it and Electronic Arts published it. It swapped the HUD for one mouse-driven arm and gave every dinosaur its own moods. Then it shipped a year before its producer thought it was ready. GameSpot called it the worst game of 1998, and Gabe Newell later cited it as an influence on the physics of Half-Life 2.

Two Looking Glass veterans, a film license and a hard deadline

Seamus Blackley and Austin Grossman, both formerly of Looking Glass Technologies, started the project and secured the film license. They signed with DreamWorks Interactive, a joint venture between Microsoft and Steven Spielberg's production company. Blackley produced and Grossman designed. The art director, Terry Izumi, had worked as a designer on Disney's Tomorrowland, and the animator George Edwards was a Disney veteran. The game was sold as a follow-up to The Lost World, with Minnie Driver as the heroine Anne and Richard Attenborough back as John Hammond. Hammond's memoir clips about the park's rise and fall play as Anne explores.

The code base ran to about 302,000 lines across 23 Visual Studio projects, roughly twice what other games of the period carried. It included hand-optimized assembly for Pentium and AMD K6 processors. Blackley later admitted that he was "too young and stupid to realize that less is more." The game had been planned for fall 1997, but it slipped by about a year and went over budget several times.

In April 1998 DreamWorks told the developers that a partnership with AMD required an October release. Blackley figured the game needed at least one more year. Anne lost her left arm, since coding two arms together was too hard. Late in development the project changed from survival horror to action shooter.

One arm, no HUD and a tattoo for a health bar

Anne has no HUD: her health shows as a heart-shaped tattoo on her chest that fills with ink as she takes damage, and a chain around it means death. Ammunition is reported by Anne herself, with lines like "About eight shots" and "Feels full." Guns have no crosshair. You line the barrel up with her wrist and then steer the arm. The tattoo is my favorite idea in the game. It keeps the screen empty and still shows the one number you need.

The arm follows the mouse. TheGamer compared it to trying to "hammer a nail with a live fish." Stacking a crate and aiming a pistol both go through the same wobbling limb.

Trespasser had ragdoll physics in 1998 and carnivores locked at maximum anger

Every animation was driven by inverse kinematics instead of pre-made clips. On 1998 hardware the renderer drew outdoor scenes with hundreds of trees. Hills hid the geometry behind them. The 3D cards of the day struggled with it: the game used more textures than a Voodoo2 could handle, so software mode ran faster and sometimes looked better. Sanglard, reading the leaked source in 2014, wrote that the game demonstrated that physics and outdoor environments were possible.

Trespasser had ragdoll physics in 1998 and is remembered as a pioneer of them. It was stacking crates for puzzles six years before Half-Life 2. TheGamer says the crate puzzles basically ruin the entire game. One wrong swing of the arm knocks a stack down.

The dinosaurs got the same ambitious treatment. Each creature had its own emotions, and dinosaurs could fight each other. Then bugs made them flip moods so quickly that they stopped acting at all. The fix was to lock every carnivore at maximum anger and hunger and set the other emotions to zero. To avoid physics glitches, dinosaurs also cannot jump at you or walk into buildings.

Critics called it the worst game of 1998

GameRankings averaged 57 percent. GameSpot gave it 3.9 out of 10, IGN 4.7, Edge 2 out of 10 and Next Generation 2 out of 5. GameSpot wrote that Trespasser was "undoubtedly the worst game of 1998," and Computer Gaming World handed it a "Coaster of the Year" award. The game sold about 50,000 copies.

GamePro and AllGame each gave it 4 out of 5, and PC Zone went to 70 percent. AllGame called it "ground breaking."

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The ideas outlived the game

Other developers took more from it than the sales suggest. Besides Newell, John Carmack named its voiceover storytelling as an inspiration for the audio logs in Doom 3, and its outdoor levels partly inspired the open environments of Halo: Combat Evolved and Far Cry. The awkward arm came back as the joke of Surgeon Simulator and the original Octodad, which it partly inspired.

Spielberg came back to it too: around 2012, while he was preparing to revive the films, he contacted Blackley about a new Trespasser game called Jurassic World, centered on Billy Brennan. A management change at Universal killed it, and Blackley handed the assets to Frank Marshall, who produced the 2015 film Jurassic World. In September 2019 Blackley was a guest on the Angry Video Game Nerd episode about the game.

Fans have been patching and rebuilding it for decades

Fans built the TresEd level editor and, once they had the original source code, wrote unofficial patches. Sanglard wrote in June 2014 that the code has "never been officially released but it is everywhere on the internet," and that fans made new dinosaurs and levels and even started a remake. The hub for all of it, TresCom, is still active.

The best-documented remake belongs to Larry Ellis, an Australian fan working in his spare time. In May 2014 he was rebuilding Isla Sorna in CryEngine. The engine's memory limits made his island about 20 percent smaller than the original. His plans included support for the Oculus Rift and the Razer Hydra. He told Engadget: "Anything less than 100 percent accuracy is unacceptable." By November 2018 DSOGaming described a one-person CryEngine remake called Trespassing as still in development but "not progressing at a steady pace," with no release date.

How to play Trespasser today

I found no Steam listing. As of October 23, 2026, GOG has the game only on its Dreamlist, where 7,971 people had voted to bring it to the store. So you need a copy of the original disc. Then you apply the 1.1 patch, which TresCom dates to November 1998, and the fan patch Trespasser CE. Version 1.07e, by a modder called Parasaurolophus and updated in July 2022, is a 2.5 MB file that adds DirectX 9 and OpenAL sound and improves support for modern Windows versions. On Linux, a Lutris installer runs the game under Wine, asks for the 1.1 patch and the CE files, and uses DXVK instead of installing DirectX.

Questions people ask

Why did Jurassic Park Trespasser fail?

It shipped unfinished. The AMD deadline pulled the release into October 1998, a year earlier than the producer wanted. Critics named poor performance, bugs, slow movement and weak voice acting, and the mouse-driven arm made basic actions hard.

What is the best Jurassic Park game?

By the scores, not Trespasser: it averaged 57 percent on GameRankings. It is the Jurassic Park game whose ideas traveled furthest, though, into Half-Life 2's physics and Doom 3's audio logs.

Is Jurassic Park Trespasser on Steam?

No. I found no Steam listing, and GOG only has it as a Dreamlist wish. You need the 1998 disc plus the patches above.

Does Trespasser run on Windows 10 or 11?

With the fan patch. Trespasser CE improves support for modern hardware and Windows versions on top of the 1.1 patch. I found no official test on Windows 11.

Is there a Jurassic Park Trespasser remake?

Not a finished one. Larry Ellis announced a CryEngine remake in 2014, and the last report I found, from 2018, gave it no release date.

Who plays Anne in Trespasser?

Minnie Driver voices Anne, the sole survivor of a plane crash on Isla Sorna. Richard Attenborough reads John Hammond's journal entries.