Free printable · Answer key included
Printable 15x15 Nonograms (Hard)
Fifteen-by-fifteen nonograms are long, absorbing solves with clue lists up to the edge of the grid. Print one per sitting, keep a sharp pencil, and mark empty squares as you go.
This first pack has four nonograms with an answer key on the second page. Between 54 and 58 percent of the squares end up shaded, so no two grids look alike.
15x15 Nonograms (Hard)
logicpuzzles.ca/printable/nonograms/hard-15x15
Puzzle 1 · #177
13111
31221
2115
3126
52121
613
21123
1111
11331
13122
6211
51
123211
11134
21111
212
621
66
136
1413
2112
4211
14112
1121
412
12111
4131
622
222
2324
Puzzle 2 · #197
1261
2114
712
22231
111113
3242
4121
41211
11312
323
2213
233
3211
1141
21111
523
41141
1611
5211
122
241
1123
12212
41222
233
21141
21312
313
12221
1412
Puzzle 3 · #183
12211
1113
112
11121
13115
163
7311
242
31411
112
4111
1512
5113
12312
11241
513
1133
11113
145
113121
1311
143
21151
51
41111
2132
21121
253
63
111121
Puzzle 4 · #184
11121
1521
45
1152
311111
8
1351
21121
211
7111
2131
1334
1423
11141
11321
3232
31121
3111
1212
11113
31211
534
42111
63
12223
1512
1331
11121
111112
12114
Answers: 15x15 Nonograms (Hard)
logicpuzzles.ca/printable/nonograms/hard-15x15
Puzzle 1
13111
31221
2115
3126
52121
613
21123
1111
11331
13122
6211
51
123211
11134
21111
212
621
66
136
1413
2112
4211
14112
1121
412
12111
4131
622
222
2324
Puzzle 2
1261
2114
712
22231
111113
3242
4121
41211
11312
323
2213
233
3211
1141
21111
523
41141
1611
5211
122
241
1123
12212
41222
233
21141
21312
313
12221
1412
Puzzle 3
12211
1113
112
11121
13115
163
7311
242
31411
112
4111
1512
5113
12312
11241
513
1133
11113
145
113121
1311
143
21151
51
41111
2132
21121
253
63
111121
Puzzle 4
11121
1521
45
1152
311111
8
1351
21121
211
7111
2131
1334
1423
11141
11321
3232
31121
3111
1212
11113
31211
534
42111
63
12223
1512
1331
11121
111112
12114
How to solve
- Read the clues: The numbers beside a row (or above a column) are the lengths of its shaded blocks, in order, with at least one empty square between blocks.
- Start with big blocks: A block longer than half the line always covers its middle squares, wherever it slides.
- Mark the empties: Put a dot or an X in squares that must stay empty. They cut lines into smaller pieces.
- Cross over: Every square you settle in a row is new information for its column, and the other way round.
Free to print and copy for home, classroom and library use. Every puzzle has one answer you can reach by logic alone.