Toby Fox has released a new update on the development of Deltarune — the fifth chapter of long-term construction has already reached the finish line. The creator of the iconic Undertale has confirmed that the main production is almost complete, and the start of large-scale testing is scheduled for April 1, 2026. If everything goes according to plan, a full-fledged release will take place in the second half of the year, although the developer is still holding back the exact date.
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When will the fifth chapter of Deltarune be released and what is known about the development
The process is moving briskly — judging by Toby Fox’s posts on social media, most of the team has already closed their tasks for chapter five and switched to the next stages of the project. Right now, the authors are focused on polishing: they are cleaning out bugs and preparing the build for the final check.
The action plan after the tests looks standard:
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Final debugging: correction of critical errors based on feedback from testers.
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Console certification: version approval with platform holders (Sony, Nintendo and others).
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Technical preparation: uploading distributions to stores and the final pre-launch.
Deltarune Release History and Steam Success
Deltarune is not just a game, but a full—fledged spiritual successor to Undertale, which Fox releases in portions. It was a long journey: the first chapter was released back in 2018, the second had to wait until 2021, and the third and fourth broke into the charts simultaneously in June 2025.
The project holds the bar for quality — the game now has 98% positive reviews on Steam, which is a phenomenal result for the indie sector. There are seven chapters planned in the saga, so the fifth part will be an important step towards the end of this story. We are waiting for the official announcement of the date — most likely, it will be saved for the summer.
However, such announcements are only a small part of a larger one, because the actual release date of the fifth chapter depends on a number of technical nuances.
Deltarune Release Schedule: Testing, console checks, and delay risks
Toby Fox already has something to show the audience — professional testers are “warming up” a fresh build with might and main, and from April 1, 2026, they will switch to full-fledged content passing through strict checklists. In parallel, the team is finishing the final QA of the Japanese localization. The developers check every detail: from specific fonts and character hyphenation to the correct display of text on all target platforms. While some experts are trying to find vulnerabilities in the combat system, the bulk of the Toby Fox team has already switched to planning post-release patches and preparing ports for current-generation consoles.
The roadmap of the project looks quite transparent if you draw parallels with the launch of chapters 3 and 4. The algorithm is familiar:
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Bug cleanup: Eliminate critical errors identified during internal and external testing.
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Build master builds: prepare unique versions of the game for specific stores.
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Certification: sending the project for verification to Nintendo, Sony and other digital stores.
At this stage, any technical misfire — whether it’s a crash when going into sleep mode on the Nintendo Switch or a bug with trophies on the PlayStation — can slow down the process for several weeks. The team will have to promptly release fixes and re-run them through a sieve of censors.
Judging by the current updates and the “2026” mark in the credits of the previous episode, it’s not worth waiting for the premiere in the first half of the year — the schedule of localization and porting tasks is packed to capacity. The realistic exit window is the second half of 2026, but adjusted for possible shifts. If the certification goes smoothly, the release may take place in the fall. If rare errors are found in the saves, the deadlines will inevitably expire by December. At the same time, Fox itself does not intend to adapt to the needs of marketing or major game exhibitions — it will click on the “publish” button as soon as the build is fully ready.
Working with the expectations of fans on Reddit and Twitter remains an important factor. Any careless “soon” from the developer is instantly interpreted in Discord communities as an announcement for the coming summer. That is why Toby Fox is as careful as possible in his formulations — a flexible internal schedule allows you to avoid reputational losses due to sudden transfers.
