Most improved levels

 1. Freefall           39 times
    Apple Harvest      39 times
 3. Sink               35 times
 4. Haircut            34 times
 5. Zig-Zag            33 times
    Tricks Abound      33 times
 7. Pipe               31 times
    Enduro             31 times
 9. Circuitous         30 times
    Labyrinth Pro      30 times
11. Labyrinth          28 times
    Flat Track         28 times
    Slalom             28 times
    Uphill Battle      28 times
15. Steep Corner       27 times
    Over and Under     27 times
    Double Trouble     27 times
18. Hill Legend        26 times
    Shelf Life         26 times
    Curvaceous         26 times
    Hang Tight         26 times
22. Gravity Ride       25 times
    What the Heck      25 times
24. Twin Peaks         24 times
    Long Haul          24 times
    Tunnel Terror      24 times
27. Quick Round        23 times
    Ramp Frenzy        23 times
    Enigma             23 times
30. Islands in the Sky 22 times
    Serpents Tale      22 times
    New Wave           22 times
    Hangman            22 times
    Headbanger         22 times
    Expert System      22 times
    Tag                22 times
37. Turnaround         21 times
    Bounce Back        21 times
    Bumpy Journey      21 times
    He He              21 times
    Hooked             21 times
42. Upside Down        20 times
    Jaws               20 times
    Bowling            20 times
45. The Steppes        19 times
    Spiral             19 times
    Framework          19 times
48. Animal Farm        18 times
49. Fruit in the Den   17 times
50. Warm Up            16 times
51. Loop-de-Loop       15 times
    Hi Flyer           15 times
53. Downhill           14 times
54. Precarious          9 times