# Sidereal Confluence

Sidereal Confluence is a board game for 4–9 players. It plays in 120–180 minutes and is meant for ages 14 and up. Ludoya players call it best with 6. It is rated 7.9 out of 10 by 20 Ludoya reviewers. The cheapest copy in stock is $96.98 (United States).

- **Players:** 4–9 (best with 6)
- **Playing time:** 120–180 minutes
- **Minimum age:** 14+
- **Complexity:** 3.6 out of 5
- **Year published:** 2017
- **Categories:** Science Fiction, Space Exploration, Negotiation, Economic, Real-time
- **Mechanics:** Tech Trees / Tech Tracks, Income, Variable Player Powers, Trading, Negotiation, Simultaneous Action Selection, Real-Time, Auction: Sealed Bid, Hidden Victory Points
- **Ludoya rating:** 7.9 out of 10, from 20 reviews
- **Owned by:** 43 Ludoya players
- **Plays logged on Ludoya:** 87
- **Unique players:** 217

**Designers:** TauCeti Deichmann

**Artists:** Nakarin Sukontakorn, Kwanchai Moriya, Jesse Seidule

**Publishers:** WizKids (I)

## Where to buy in United States

| Shop | Price | Link |
| --- | --- | --- |
| Zatu Games | 57.5 £ | https://zatu.com/products/sidereal-confluence-remastered-edition |
| Alphaspel | 849 kr | https://alphaspel.se/491-bradspel/113508-sidereal-confluence-remastered-edition |
| Nexus | 12995 kr | https://nexus.is/vara/sidereal-confluence-remastered-edition/ |

## Expansions

- [Sidereal Confluence: Bifurcation](https://www.ludoya.com/games/sidereal-confluence-bifurcation)
- [Sidereal Confluence: Proliferation](https://www.ludoya.com/games/sidereal-confluence-proliferation)

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## Rules questions

### Are trades binding — can someone back out after a deal in the Trade Phase?

Trades made during the Trade Phase are binding once all parties agree; breaking an agreed deal can incur the penalties described for the Trade Phase (no renegotiation). (p.10)

### When I 'run' a violet converter, do I run the top card or put a new card into play?

Running a violet converter executes the converter’s top card; when upgrading a converter you may either run the top card or spend to put it into play, per the converter rules. (p.11)

### What happens in the Economy Phase if I can’t pay Colony Support?

During the Economy Phase there is no negotiation and you must perform the Colony Support check; if you cannot support a colony you must discard it as specified in the Economy Phase rules. (p.12)

### If I share a technology during Confluence, do I get the Sharing bonus and when is it awarded?

Yes — when you share technology during the Confluence step you earn the Sharing bonus as described in the Confluence rules; follow the sharing procedure in that phase to claim it. (p.14)

### Can I split my ships between colony bids and research team bids?

You may split your ships between bids in the Confluence (colony vs. research); see the Confluence bidding rules for how to allocate, reveal, and resolve buy/pass decisions. (p.14–15)

### How do wild resources work — how do they count for costs and support?

Wild resources are subject to the size rules printed on them and count according to their printed size when used for costs or support, with special interactions noted for certain species (see the wild resource section). (p.13)

## Links

- [This page](https://www.ludoya.com/games/sidereal-confluence)
- [Sidereal Confluence in the Ludoya app](https://app.ludoya.com/g/sidereal-confluence)
- [BoardGameGeek entry](https://boardgamegeek.com/boardgame/202426)

_Data from Ludoya, updated 2026-09-24. Ratings, ownership and play counts are Ludoya's own._