GETTING STARTED / FIELD NOTE

Demo or Early Access? Know the difference.

Official information3 min readCollection reviewed 2026-11-13

Dated release & demo announcementsNot tested in-game by this site · Exact build unknown

Main Sequence entered Early Access on November 12, 2026. October Demo and September Playtest instructions belong to different version contexts.

Your next checks

Check which branch you launched and record the build if it is shown.
Match each guide’s version label to your game; an unknown build remains unknown.
Keep an untouched copy of an older save before testing compatibility.

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What this does not confirm

The reviewed reports do not prove that all demo saves are compatible or incompatible with Early Access. No migration or recovery procedure is verified here.

October Demo

The October 19 update added demo co-op and expanded research and module content. Older claims that the demo has no multiplayer may therefore be outdated. This does not mean the demo includes all Early Access content.

September Playtest

The September 21 v0.1.80 patch is a historical reference. Do not import its costs, controls, or machine values as current Early Access constants.

Moving an older save

A November 12 building-crash thread contains conflicting reports; one affected save already had a related demo problem. Preserve the original and compare a separate new save without overwriting it.

Follow the evidence

Main Sequence Available Now! ↗Official · Source date: 2026-11-12
Next Fest Demo Update ↗Official · Source date: 2026-10-19
Existing save and ship building Fatal Error ↗Player report · Source date: 2026-11-12

Summarized from the 13 November 2026 source collection. Link availability and in-game testing are separate checks. Read the verification policy.

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