Sidereal Confluence: Proliferation
BGG rating
8.8

Expansion for Sidereal Confluence

Sidereal Confluence: Proliferation

2026

Rules assistance for Sidereal Confluence: Proliferation

Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.

  • 3–9 players
  • 120–160 min
  • 10+
  • Complexity 3.0/5

Rules assistant for Sidereal Confluence: Proliferation

What would you like to know?

Answers come from the official rulebook, with the page to check.

Sidereal Confluence: Proliferation is an expansion for Sidereal Confluence released in 2026 for 3–9 players, 120–160 minutes per game, and ages 10 and up. It was designed by TauCeti Deichmann and Jacob Davenport.

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About the 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

Questions and answers

Sidereal Confluence: Proliferation supports 3–9 players according to the catalogue. This range comes from the publisher’s listed player count, so the game can be set up for any group size within it. Some setups, rules and scoring details may still vary by player count, so check your edition’s rulebook for the exact configuration.