Please tell me where I am wrong:
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×I use the mimic to toggle the doors without moving the roach, leaving left hand side open.
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×From this point, I believe that Beethro must go up the left hand side and the mimic must hit the orb.
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×If that is correct, then the only way I can see to do this is to have the mimic be immediately below the orb while Beethro travels up the left side (after the diagonal entry). I haven't been able to create that kind of separation though.