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See that square in your map? There's a switch in the north that would remove the wall of force. Throw something across the gap.
That secret switch is coded to remove the spot where you're stuck. That's the area circled.
Just before a gold staircase.
If it's the force field that isn't circled but to the left of the circled area, that's controlled by a secret switch near Tom Cat the tiger.
There's only one other wall of force and that's controlled by the secret switch on the south side of that square.