Maybe many Girls and U.S. netizens still don’t know how to use Girls and U.S.A. decoration upgrade cards. The following is "How to use Girls and U.S.A. decoration upgrade cards" compiled by the editor of Source Code.com. Players who have these questions can take a look. I hope Can help everyone.
Girl and Sea "Synthesis" page; press and hold the [Clean] tool card.
As shown in the picture; drag to the tool with the [Upgrade Arrow]
The "Tool Upgrade Card" is successfully used and upgraded to a "broom" tool.
