Weapons, the world, the train and the chainsaw engine itself are synthesised in code. Monster voices, gore and the chainsaw’s recorded layers (pull-cord, idle / full-throttle / cutting beds, bites, shutdown) use the clips below: third-party recordings used under Creative Commons licences, plus sound effects generated for the owner with Fish Audio (listed separately, their own terms), edited for this game (excerpted, trimmed, filtered, looped, level-normalised, converted to Ogg Vorbis; some pitch-shifted or layered). Thank you to the authors.

What this project made is given to the public domain (CC0 1.0): take it, change it, sell it, no permission needed. Everything that is not ours keeps its own terms (the sound clips above, the fonts, three.js, and the NASA / ESA Hubble picture in the astra logo). The plush picture and the Seal of Insanity animation are not given away: ask first. Not covered by this grant: the AI-generated voices and music of the intro, the ride and the arrival (free non-commercial terms or undecided), the generated picture plates, and the two works that are not given away. Details: LICENSING.md.