A player has reported that he tested this solution and it works.
Ringing Endorsement
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Label the Boulders
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Step One: Clear the Starting Area
  1. Push E five tiles south (beside M).
  2. Push G four tiles east, five south, and take it.
  3. Push L four tiles east and take it.
  4. Take K the same way as L.
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- - - . | . E M - - . . | G | | . + . . . . . |
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Step Two: Get Behind
  1. Push F two tiles west.
  2. Push B one tile north.
  3. Push D one tile south.
  4. Push B one tile south.
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Step Three: Open the Bottom
  1. Push A one tile east. Go down past H, N, and P.
  2. Push E one tile north, then east and take it.
  3. Take M the same way.
  4. Push R one tile north.
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Step Four: Clear the Bottom
  1. Push P two tiles east then five tiles north.
  2. Push R one south, one east, two north, and take it.
  3. Push P three tiles south, and take it.
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Step Five: Getting to F
  1. Push D one tile west.
  2. Push J four south, three east, two north, and take it.
  3. Push N one tile east, and take it the same way as J.
  4. Push C one tile west.
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Step Six: Extricating F
  1. Push F two tiles south.
  2. Go around north (nudging A over and back).
  3. Push F two tiles east. Go around past D.
  4. Push F three tiles south; go around and take it.
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Step Seven: Finish
  1. Push D one tile east, five south, go around and take it.
  2. Push B two tiles south. Take it the same way as D.
  3. Push C east and take it the same way.
  4. Push H east one, north two, and take it like C.
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