Chris Zebroski scored deep into injury time to secure a vital win for promotion-chasing Wycombe.
Wycombe had taken the lead before the break when the Quakers failed to clear a corner and David McCracken found John Akinde to score from six yards.
But Franz Burgmeier set up Jason Kennedy to level near the hour mark.
And, after Darlington keeper Przemyslaw Kazimierczak denied Matt Bloomfield, it looked like the points would be shared until Zebroski's close-range finish.
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