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A little collection of puzzles. Some easy, some very difficult...

Nails and Glue

Your goal in this puzzle is to move the pieces and/or over their respective destinations, and/or , in as few moves as possible. The buttons rotate the board to the right or to the left. After each rotation the mobile pieces fall vertically. If they fall on a nail, or in the proximity of glue , they got stuck. The button Down let the blocked mobiles fall, if possible. Sometimes you can reach a dead end: the Reset button restarts the current puzzle. Below you'll find a selection of difficult problems.

I didn't perform an exhaustive search, but while generating millions of random problems, I wrote down the most difficult I found, for each board size and number of symbols (glue, nails, etc.). Below you find a little selections of some difficult problems I found.
10 moves
.
13 moves
.
14 moves
.
16 moves
.
17 moves
.
18 moves
.
20 moves
.
26 moves
.
18 moves
.
19 moves
.
24 moves
.
30 moves
.
34 moves
.
39 moves
.
50 moves
.
27 moves
.
29 moves
.
33 moves
.
39 moves
.
41 moves
.
49 moves
.
42 moves
.
42 moves
.
43 moves
.
44 moves
.
54 moves
.