Little Nightmares: Complete Edition on Nintendo Switch is a bundled release containing the original game and all additional content in a single package. For users managing their libraries via (Nintendo Switch Package) files, this edition is notable for its compact file size and complete integration of the "Secrets of The Maw" expansion. Core Technical Profile
For homebrewed consoles, installing the Little Nightmares NSP can be done through several community-standard tools: little nightmares complete edition switch nsp d install
Here's some general information:
The Complete Edition is the definitive way to experience the horrors of "The Maw". It includes: NSP Little Nightmares: Complete Edition on Nintendo Switch
Pre-order bonuses like the Upside-Down Teapot and Scarecrow Mask. Installation Methods for NSP Files released on May 18
Little Nightmares: Complete Edition for Nintendo Switch, released on May 18, 2018