Solving Script
Puzzle # 4

Hidden single 2 in row 2  (r2c2=2)
   r2c2<>1
   r2c2<>3
   r2c2<>5
   r2c2<>9
   r5c2<>2
   r6c2<>2
Hidden single 9 in row 4  (r4c3=9)
   r1c3<>9
   r2c3<>9
   r4c3<>8
   r7c3<>9
   r8c3<>9
Hidden single 2 in row 8  (r8c7=2)
   r5c7<>2
   r8c7<>4
   r8c7<>6
   r8c7<>8
Hidden single 2 in col 1  (r5c1=2)
   r5c1<>1
   r5c1<>8
   r5c8<>2
Hidden single 8 in col 1  (r1c1=8)
   r1c1<>1
   r1c1<>7
   r1c1<>9
   r1c3<>8
   r1c7<>8
   r1c8<>8
   r1c9<>8
   r2c3<>8
Hidden single 4 in col 2  (r6c2=4)
   r6c2<>1
   r6c8<>4
   r6c9<>4
Hidden single 8 in col 3  (r6c3=8)
   r6c3<>1
   r6c5<>8
   r6c6<>8
   r6c8<>8
   r6c9<>8
Hidden single 3 in col 4  (r4c4=3)
   r4c4<>2
   r4c4<>6
   r4c8<>3
   r4c9<>3
Hidden single 2 in row 4  (r4c8=2)
   r4c8<>4
   r4c8<>6
   r4c8<>8
   r6c8<>2
Hidden single 4 in row 4  (r4c9=4)
   r2c9<>4
   r4c9<>6
   r4c9<>8
   r7c9<>4
   r8c9<>4
Hidden single 2 in row 6  (r6c4=2)
   r6c4<>6
Hidden single 4 in row 8  (r8c6=4)
   r7c6<>4
   r8c6<>6
   r8c6<>7
   r8c6<>8
   r8c6<>9
Hidden single 4 in row 7  (r7c7=4)
   r2c7<>4
   r7c7<>3
   r7c7<>6
   r7c7<>8
Hidden single 4 in row 2  (r2c8=4)
   r2c8<>1
   r2c8<>3
   r2c8<>8
   r2c8<>9
Hidden single 8 in row 8  (r8c9=8)
   r2c9<>8
   r5c9<>8
   r7c9<>8
   r8c9<>6
   r8c9<>9
Hidden single 8 in row 2  (r2c7=8)
   r2c7<>3
   r2c7<>5
   r5c7<>8
Hidden single 8 in row 7  (r7c6=8)
   r4c6<>8
   r5c6<>8
   r7c6<>6
   r7c6<>9
Hidden single 8 in row 4  (r4c5=8)
   r4c5<>6
Hidden single 6 in row 4  (r4c6=6)
   r6c5<>6
   r6c6<>6
   r9c6<>6
Hidden single 8 in row 5  (r5c8=8)
   r5c8<>3
Hidden single 6 in row 8  (r8c2=6)
   r7c2<>6
   r8c2<>9
Hidden single 9 in row 8  (r8c1=9)
   r3c1<>9
   r7c1<>9
   r7c2<>9
   r8c1<>7
Hidden single 7 in row 8  (r8c3=7)
   r1c3<>7
Hidden single 7 in col 1  (r3c1=7)
   r3c1<>1
   r3c7<>7
Hidden single 1 in col 1  (r7c1=1)
   r7c2<>1
   r7c3<>1
   r7c9<>1
Hidden single 1 in box 4  (r5c2=1)
   r1c2<>1
   r3c2<>1
   r5c6<>1
Naked single 6 row 6 column 8  (r6c8=6)
   r1c8<>6
   r3c8<>6
   r6c9<>6
   r9c8<>6
Naked double row 7 - 35
   r7c9<>3
HR(hidden rectangle) 25 66 digit = 5
   r6c6<>5
ER_Row1 = 6 Row2 = 2 col1 = 5 col2 = 9 digit = 5 target = 29 hinge = 25
   r2c9<>5
Naked Triplets 139 in box 3
   r1c7<>3
   r1c9<>1
   r1c9<>3
   r1c9<>9
ER_Row1 = 2 Row2 = 7 col1 = 6 col2 = 9 digit = 9 target = 79 hinge = 76
   r7c9<>9
Hidden single 9 in row 7  (r7c4=9)
   r1c4<>9
   r7c4<>6
   r9c6<>9
Hidden single 6 in row 7  (r7c9=6)
   r1c9<>6
   r9c7<>6
   r9c9<>6
Hidden single 6 in row 9  (r9c5=6)
   r3c5<>6
   r9c5<>7
Hidden single 6 in row 3  (r3c7=6)
   r1c7<>6
   r3c7<>5
Hidden single 6 in row 1  (r1c4=6)
Hidden single 7 in row 9  (r9c6=7)
   r5c6<>7
   r6c6<>7
Hidden single 7 in col 5  (r6c5=7)
   r6c5<>1
   r6c5<>5
   r6c9<>7
Hidden single 1 in row 6  (r6c6=1)
   r2c6<>1
Hidden single 5 in row 6  (r6c9=5)
   r1c9<>5
   r5c7<>5
   r5c9<>5
Hidden single 5 in row 5  (r5c6=5)
   r2c6<>5
Hidden single 9 in col 6  (r2c6=9)
   r2c9<>9
Hidden single 5 in col 7  (r1c7=5)
   r1c2<>5
   r1c3<>5
   r1c7<>7
Hidden single 7 in row 1  (r1c9=7)
   r5c9<>7
Hidden single 7 in row 5  (r5c7=7)
   r5c7<>3
Hidden single 3 in row 5  (r5c9=3)
   r2c9<>3
   r9c9<>3
Hidden single 3 in row 2  (r2c3=3)
   r1c2<>3
   r1c3<>3
   r2c3<>1
   r2c3<>5
   r7c3<>3
Hidden single 3 in row 1  (r1c8=3)
   r1c8<>1
   r1c8<>9
   r9c8<>3
Hidden single 1 in row 1  (r1c3=1)
Hidden single 9 in row 1  (r1c2=9)
   r3c2<>9
Hidden single 5 in row 2  (r2c5=5)
   r2c5<>1
   r3c5<>5
Hidden single 1 in row 2  (r2c9=1)
   r3c8<>1
   r9c9<>1
Hidden single 1 in row 3  (r3c5=1)
Hidden single 5 in row 3  (r3c2=5)
   r7c2<>5
Hidden single 9 in row 3  (r3c8=9)
   r9c8<>9
Hidden single 3 in row 7  (r7c2=3)
Hidden single 5 in row 7  (r7c3=5)
Hidden single 1 in row 9  (r9c8=1)
Hidden single 3 in row 9  (r9c7=3)
Hidden single 9 in row 9  (r9c9=9)

Solved!