Which Expansion

SETI: Search for Extraterrestrial Intelligence expansions

Base game: 1–4 players40–160 minCzech Games Edition1 expansion checked
  1. #1 overall

    SETI: Space Agencies

    Worth it

    BGG 8.85 from 2,354 ratings. Reviewers praise the new aliens and cards; some find the agencies forgettable and the Quick Start unsatisfying, and the game is not shorter.

    Needs: Just the base game

    Adds: 11 asymmetric organizations, 3 new alien species, 42 new project cards, 21 Quick Start cards that replace the first round, and signal tokens that help scanning.

    Fixes: Quick Start cards replace the slow opening round.

    Expansion1–4 playersAbout the same rules loadFine for any groupPrice: $20–$40
    DetailsReference:View on BoardGameGeekBuy:CGE US StoreCzech Games Edition

Need the base game?

Reference:View on BoardGameGeekBuy:CGE US Store

SETI: Search for Extraterrestrial Intelligence expansions: quick answers

Which SETI: Search for Extraterrestrial Intelligence expansion should I buy first?

SETI: Space Agencies. BGG 8.85 from 2,354 ratings (base game 8.41 from 22,593). Reviewers praise the new aliens and cards; some find the organizations forgettable and the Quick Start feels like skipping the opening, and the game is not shorter.

Is SETI: Space Agencies worth it?

Our verdict: worth it. It adds: 11 asymmetric organizations, 3 new alien species, 42 new project cards, 21 Quick Start cards that replace the first round, and signal tokens that help scanning.

How many SETI: Search for Extraterrestrial Intelligence expansions are there?

We checked 1 SETI: Search for Extraterrestrial Intelligence expansion and ranked 1 of them in buy order.

Other games’ expansion guides

Same publisher

Rankings are our editorial picks, built from the reviews linked on each expansion page. Last checked 2026-10-15.