Hi WingedYoshi
I found a guide for how to build a basement here: Click here!
It helped me and hope it will help you too, if not please contact me for more information
- Amalie
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Please note, I do not work for EA, I will try to help you as best as I can.
I can not be held responsible for any damage to your computer or game.
Under Wall tools in Build Mode there is a custom basement tool, the second basement tool, not the one that builds walls as you move the cursor. Use that WHILE viewing the floor above, draw the outline of the basement you want. The game will pop the basement into place once you connect back to your starting point.
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