What the sources confirm

The top community-wiki result describes an alternate-reality marketing campaign and an interactive Minecraft Launcher note-block sequence. It records the input and rune string; this is a community write-up, not an official walkthrough.

What is not confirmed yet

The second result was inaccessible, so the sequence was not independently corroborated. The community page says the campaign ended September 18, 2026. No official game guide confirms this as a mission puzzle or item code.

How to use this answer

Use the linked source only for the archived ARG. Do not present the sequence as an in-game solution or assume it redeems an item.

Visual reference

Original fan-made voxel artwork for Note Block ARG
Original fan-made artwork for this independent wiki. It is not an in-game screenshot or gameplay evidence.