Puzzles in which Jeff is first on the podium in the ranking based on time

Also check the puzzles where Jeff is in a specific place in the ranking based on time:
and in the ranking based on moves:

little dog puzzle online from photoDer Heilige Abend - Christmas Eve puzzle online from photostamps 2 puzzle online from photoMOUSE puzzle online from photoGornik Zabrze puzzle online from photoNew Series puzzle online from photoClass 801 Stepford Express online puzzleLondon puzzle online from photoBirds Eye Eieffel France online puzzlePublic Works online puzzleYagong island Stack and solve puzzle online puzzleSchools of Magic puzzle online from photo