Underwater Cities
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When a slot lets you upgrade up to three structures, can they be different types or the same one twice?
The rulebook states this in its ACTION SLOTS AND CARD EFFECTS section.
- Underwater Cities rulebook · Rulebook · ACTION SLOTS AND CARD EFFECTS
- Dark2025 · Community · 2025-11-11
- ryan3740 · Community · 2025-11-11
- drathbun · Community · 2025-11-11
They can be any mix of structure types, including three tunnels, but each structure can be upgraded only once because an upgraded structure cannot be upgraded again. Each upgrade costs 1 science.