What are the requirements for "expand field" in Pocket League Story?

android pocket-league-story

Solution 1:

Winning "Regional Cup" can unlock "Expend Field".

Solution 2:

According to the official guide on Kairospot's website, the only requirement for the Expand Field upgrade is winning the Regional Cup. Click the Facilities tab and then Stadium Upgrades to see the requirements for all stadium upgrades.

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