Go through the tunnel behind Neo Cortex and go right to the right of the big door is a
body slam pad. Use that and go back to the triangle sign and keep going the gate should be
unlocked there should be another pad. Go to the ledge and jump to the left there is
another leedge with the key on it

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I don't think u use a key cuz I'm past that in my game and I didn't find a key to unlock
ninas goth mobile I think I payed her money.