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How would you solder this board? (usb hack)
Thenasty:
GROUND is GROUND. On PCB, there are usually many GROUND points. You could use any one.
I suggest you use a Multimeter to make sure what you see is what it is.
Lilwolf:
Which ever wire goes to more then one connection is the ground wire. All the others are one for a button. Follow the traces on the board.