Since its surprise release in 2018, Toby Fox’s Deltarune has captivated fans of the Undertale universe. The arrival of Chapters 1 and 2 as a combined, free-to-start package on the Nintendo Switch eShop was a major event. However, for users navigating the technical side of digital game files—specifically the format—questions often arise regarding installation, updates, and cross-chapter functionality. This article provides a solid, factual overview of how Deltarune Chapters 1 and 2 work in the NSP ecosystem on the Switch.

Some Switch users reported input lag during the and Berdly fights. The v1.0.4 update (or the latest signature patch applied to the NSP) smooths out frame timing in those high-action sequences.

An NSP file is essentially an archive containing multiple NCAs (Nintendo Content Archives). These NCAs hold the executable (the game logic), the romfs (game assets like images and music), and meta-data.

The only lingering issue? Many pre-existing EdiZon codes for infinite HP or TP break after this update due to shifted memory addresses. If you rely on cheats, stick with the older v1.0.2 NSP.

The latest major updates (such as v1.02) addressed several platform-specific issues: Nintendo Everything Deltarune 1.02 update out now, patch notes 8 Jul 2025 —

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