Catan Expansion Compatibility Matrix

Catan's expansions don't all combine. Some pairings are officially supported (Cities & Knights + Seafarers), some require house rules (Traders & Barbarians + various scenarios), and some don't work at all (e.g., Rivers of Catan with Seafarers' sea hexes). This page is the reference matrix.

Required base + extensions

The starting point: every Catan game requires the base box. Major expansions add layers; 5-6 player play requires both the base 5-6 player expansion and the matching 5-6 extension for whatever expansion you're using.

The core combinations

The compatibility matrix (3-4 player combinations)

Each row indicates whether combining the row's expansion with the column's expansion is officially supported. ✓ Official = supported by rulebook. ~ Partial = some scenarios work, some don't. ✗ Not supported = doesn't combine.

The "partial" combinations explained

Seafarers + Traders & Barbarians

Most T&B scenarios don't combine with Seafarers because Seafarers' sea hexes conflict with T&B scenario-specific tile placements. Specifically:

• ✓ Fishermen of Catan + Seafarers — works cleanly. Fishing tiles attach to coastal intersections; sea hexes accommodate them.
• ✓ Barbarian Attack + Seafarers — works with house rules; the barbarian camps occupy land hexes, which Seafarers preserves.
• ✗ Rivers + Seafarers — river hexes can't coexist with sea hexes geographically.
• ✗ Caravans + Seafarers — the caravan path requires continuous land; sea hexes break it.
• ~ Title T&B scenario + Seafarers — possible but requires extensive house-rule adaptation. Most groups skip this combination.

Cities & Knights + Traders & Barbarians

C&K's commodity-heavy production demands full hex production. Most T&B scenarios reduce or modify hex production, which conflicts. Specifically:

• ~ Fishermen + C&K — works but adds substantial complexity; rare combination.
• ✗ Rivers + C&K — reduced production fights C&K's commodity demand.
• ~ Barbarian Attack + C&K — both have knight mechanics that conflict. C&K's knights handle the barbarian ship; T&B's scenario-knights are different pieces. Players sometimes use one or the other, not both.
• ✗ Caravans + C&K — caravan resource cost (wheat, sheep) conflicts with C&K's commodity tracks. Rare combination.
• ✗ Title T&B + C&K — explicitly not supported; the title scenario is its own complete game.

Cities & Knights + Seafarers

This is the canonical "big combination." Most C&K + Seafarers scenarios use the Seafarers map as the underlying geography and layer C&K mechanics on top. The combined game takes 2.5-3 hours and uses 14 VP threshold.

Specifically supported scenarios: Heading for New Shores + C&K, Four Islands + C&K, Greater Catan + C&K. The Seafarers rulebook includes specific notes for the C&K combination.

The 5-6 player combinations

For 5-6 player versions, the rules are stricter:

• Seafarers 5-6 + C&K 5-6: ✓ Officially supported but requires four boxes (base, 5-6, Seafarers, Seafarers 5-6 extension) + Cities & Knights + C&K 5-6 extension. The longest, most complex Catan format. 3+ hours.
• Other 5-6 multi-expansion combinations: Generally not officially supported. Component constraints make them impractical.

Explorers & Pirates

Explorers & Pirates is structurally different from other expansions — it's a campaign series of five scenarios rather than a single layered ruleset. As a result, it doesn't combine with other expansions. Play E&P on its own.

Standalone variants

These don't combine with anything — they're complete games:

• Catan: Starfarers — standalone Catan in space.
• Catan: Rise of the Incas — standalone with collapse mechanics.
• Catan: Histories trilogy (Settlers of America, Trails to Rails, Settlers of Canaan) — standalone games using Catan mechanics.
• Catan Junior — standalone kid-version.

The short variants

The four short variants from Traders & Barbarians (Harbor Masters, Friendly Robber, Catan Event Cards, Catan for Two) do combine with most setups. They're rule overlays rather than scenarios, so they layer cleanly:

• Harbor Masters — works with base, Seafarers, C&K (gives extra VP for port variety).
• Friendly Robber — works with base, Seafarers, C&K (prevents robber on ≤2 VP players).
• Event Cards — replaces dice with a deck; works with anything dice-based.
• Catan for Two — specific 2-player adaptation; doesn't combine with multi-player setups.

The "what to buy" decision

If you're buying expansions and want maximum compatibility:

1. Base Catan (required).
2. 5-6 expansion (if your group is >4 players).
3. Cities & Knights + C&K 5-6 extension (depth, combines with Seafarers).
4. Seafarers + Seafarers 5-6 extension (visual variety, combines with C&K).
5. Traders & Barbarians + T&B 5-6 extension (scenario variety, plays standalone or with limited combinations).
6. Explorers & Pirates + E&P 5-6 extension (campaign play, standalone).

The first three give you the most flexibility. The rest add variety but with diminishing combinatorial returns.

For generator-based play

This site provides balanced board generators for each of the major expansion configurations. Each generator handles the underlying hex layout; expansion-specific components (commodities, ships, scenario tiles) are placed manually per the rulebook.

• Base Catan generator
• 5-6 expansion generator
• Seafarers generator (3-4)
• Seafarers 5-6 generator
• Cities & Knights generator (3-4)
• Cities & Knights 5-6 generator
• Traders & Barbarians generator (3-4)
• Traders & Barbarians 5-6 generator