Here are some of the more interesting and/or challanging levels in this group
of puzzles:
(Note the number of astericks indicate the degree of challange/interest):

mds1.pzl level:
21**
46
50

mds2.pzl level:
2
4***
5**
10*
12*
13
14***
18
19
20
21
22
26

mds3.pzl level:
3
5*
8*

turk2.pzl level:
1*

turk3.pzl level:
1*

turkey1.pzl levels:
1*
2**
4**
5*
10***
11***

turkey2.pzl levels:
2**

NOTE:  mds2.pzl, levels 4 and 14  AND  turkey1.pzl, levels 10 and 11 are
especially challanging