Oceans and Empires Contents Building
I can’t upgrade my Gates even though I have enough resources!

Unlike other buildings, Gates require an extra resource, cannons.

If you cannot upgrade even if you have enough food/wood/iron/silver,

scroll down to check cannon number at the bottom of the upgrade pop up.

※ If you research a high tier ship in the Ship section at the Royal Academy,

you can create the needed cannons at the Cannon Factory.

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