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This guide explains what the Error Code 100 in Umamusume Pretty Derby means and the potential fixes you can try to resolve it.
Umamusume Pretty Derby has found large-scale popularity globally upon its release on Steam on June 26, 2025. It’s an anime gacha where you train and help several girls run races. While the game has found many takers, the launch on Steam hasn’t been without issues.
The biggest among them arguably was the Error Code 100 problem that many gamers reportedly faced. In this guide, we’ll take a look at the Error Code 100 in Umamusume Pretty Derby issue and what you can do to fix it.
What Is Error Code 100 in Umamusume Pretty Derby?
The Error Code 100 problem cropped up on July 9, 2025. It specifically impacted players who were doing a Career playthrough. In some instances, the error even deleted the entire Career mode progress for players, leaving them in a lurch. With their progression gone, most didn’t have any option but to start anew. However, as soon as the community started reporting this mysterious error, Cygames seemed to have taken some steps to fix it.
As of this writing, Error Code 100 has been resolved. We still don’t know exactly what was causing the issue. Most likely it was an error pertaining to the game’s server, which kept players from accessing or finishing any of the Career activities. However, with the problem now gone, you can once again dive into the Career mode playthrough.
Also Read: Umamusume Pretty Derby: How To Obtain and Use Racing Shoes
Cygames also offered a compensation gift to its player base because of the error. Now, you can head to the presents screen to find a Toughness 30 item available in their inventory. Although a free item won’t make up for hours that players might have lost in Career progression because of the issue, it still showcases the developer’s commitment to quick resolutions of any in-game problems.
Also Read: Umamusume Pretty Derby: Best Ways To Earn Monie
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