Sidereal Confluence: Proliferation, Layer by Layer

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No expansions or promos on record for this game.

Expansion for Sidereal Confluence, just requires the base game but works with Bifurcation.

Adds 42 advanced colonies, played during rounds 2-5, that make buying colonies valuable on every round.

Adds cards and rules for real-time bidding.

—description from the publisher

Categories: Expansion for Base-game Economic Negotiation Real-time Science Fiction
Family: Sidereal Confluence
BGG ratings: 13
BGG data: refreshed Sep 7, 2026