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How do production multipliers (x2, x3) work, and what do they multiply?

The rulebook states this in its ACTION SLOTS AND CARD EFFECTS section.

  • Underwater Cities rulebook · Rulebook · ACTION SLOTS AND CARD EFFECTS
  • pacemaker67 · Community · 2026-08-03
  • Tall_Walt · Community · 2019-03-27
  • Thunkd · Community · 2021-03-12
  • Biaxident · Community · 2021-03-12
  • MDJD · Community · 2018-12-08

A multiplier makes the structure on that site produce its usual amount extra times, but only the usual production of that structure. The bonus for a pair of upgraded buildings and other site bonuses are not multiplied, and a x2 does not double a double-upgrade output. Multipliers apply only during Production, not when a card such as Night Shift copies production.

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