Use these positions to check the answer quickly before reading the logic.
C1
Row 1, Column 3
I2
Row 2, Column 9
D3
Row 3, Column 4
B4
Row 4, Column 2
F5
Row 5, Column 6
J6
Row 6, Column 10
A7
Row 7, Column 1
G8
Row 8, Column 7
E9
Row 9, Column 5
H10
Row 10, Column 8
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Each step has a board image with descriptive alt text, so the answer can be reviewed without watching the video.
1
Step 1: Place the cat at C1
The board reaches 1/10 cats after the placement at C1.
Visual step: C1
Use this image to confirm the cat at C1, row 1, column C. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 1/10 cats placed.
C1 is the new cat for this step.
9 cats remain after this placement.
2
Step 2: Place the cat at D3
The board reaches 2/10 cats after the placement at D3.
Visual step: D3
Use this image to confirm the cat at D3, row 3, column D. Keep the earlier cats at C1. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 2/10 cats placed.
D3 is the new cat for this step.
8 cats remain after this placement.
3
Step 3: Place the cat at I2
The board reaches 3/10 cats after the placement at I2.
Visual step: I2
Use this image to confirm the cat at I2, row 2, column I. Keep the earlier cats at C1, D3. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 3/10 cats placed.
I2 is the new cat for this step.
7 cats remain after this placement.
4
Step 4: Place the cat at B4
The board reaches 4/10 cats after the placement at B4.
Visual step: B4
Use this image to confirm the cat at B4, row 4, column B. Keep the earlier cats at C1, D3, I2. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 4/10 cats placed.
B4 is the new cat for this step.
6 cats remain after this placement.
5
Step 5: Place the cat at G8
The board reaches 5/10 cats after the placement at G8.
Visual step: G8
Use this image to confirm the cat at G8, row 8, column G. Keep the earlier cats at C1, D3, I2, B4. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 5/10 cats placed.
G8 is the new cat for this step.
5 cats remain after this placement.
6
Step 6: Place the cat at E9
The board reaches 6/10 cats after the placement at E9.
Visual step: E9
Use this image to confirm the cat at E9, row 9, column E. Keep the earlier cats at C1, D3, I2, B4, G8. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 6/10 cats placed.
E9 is the new cat for this step.
4 cats remain after this placement.
7
Step 7: Place the cat at F5
The board reaches 7/10 cats after the placement at F5.
Visual step: F5
Use this image to confirm the cat at F5, row 5, column F. Keep the earlier cats at C1, D3, I2, B4, G8, E9. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 7/10 cats placed.
F5 is the new cat for this step.
3 cats remain after this placement.
8
Step 8: Place the cat at H10
The board reaches 8/10 cats after the placement at H10.
Visual step: H10
Use this image to confirm the cat at H10, row 10, column H. Keep the earlier cats at C1, D3, I2, B4, G8, E9, F5. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 8/10 cats placed.
H10 is the new cat for this step.
2 cats remain after this placement.
9
Step 9: Place the cat at J6
The board reaches 9/10 cats after the placement at J6.
Visual step: J6
Use this image to confirm the cat at J6, row 6, column J. Keep the earlier cats at C1, D3, I2, B4, G8, E9, F5, H10. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 9/10 cats placed.
J6 is the new cat for this step.
1 cat remains after this placement.
10
Step 10: Place the cat at A7
The board reaches 10/10 cats after the placement at A7.
Visual step: A7
Use this image to confirm the cat at A7, row 7, column A. Keep the earlier cats at C1, D3, I2, B4, G8, E9, F5, H10, J6. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 10/10 cats placed.
A7 is the new cat for this step.
All 10 cats are now placed without sharing a row or column.
Final board image
Final screenshot source: Step 10, focused on A7.
Logic recap
Why This Solves Level 172
The final placements (C1, I2, D3, B4, F5, J6, A7, G8, E9, H10) cover 10 rows and 10 columns exactly once. Each cat stays inside the 10x10 board and keeps the row, column, and no-touching rules intact.
Final check
Rows 1-10 each contain one cat.
Columns A-J each contain one cat.
No two final cats touch, including diagonally.
Optional video
Video Walkthrough
Use the images and written steps first. Watch the video only if you want to compare the full solve.