Use these positions to check the answer quickly before reading the logic.
E1
Row 1, Column 5
A2
Row 2, Column 1
G3
Row 3, Column 7
I4
Row 4, Column 9
C5
Row 5, Column 3
F6
Row 6, Column 6
D7
Row 7, Column 4
B8
Row 8, Column 2
H9
Row 9, 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 G3
The board reaches 1/9 cats after the placement at G3.
Visual step: G3
Use this image to confirm the cat at G3, row 3, column G. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 1/9 cats placed.
G3 is the new cat for this step.
8 cats remain after this placement.
2
Step 2: Place the cat at I4
The board reaches 2/9 cats after the placement at I4.
Visual step: I4
Use this image to confirm the cat at I4, row 4, column I. Keep the earlier cats at G3. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 2/9 cats placed.
I4 is the new cat for this step.
7 cats remain after this placement.
3
Step 3: Place the cat at F6
The board reaches 3/9 cats after the placement at F6.
Visual step: F6
Use this image to confirm the cat at F6, row 6, column F. Keep the earlier cats at G3, I4. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 3/9 cats placed.
F6 is the new cat for this step.
6 cats remain after this placement.
4
Step 4: Place the cat at D7
The board reaches 4/9 cats after the placement at D7.
Visual step: D7
Use this image to confirm the cat at D7, row 7, column D. Keep the earlier cats at G3, I4, F6. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 4/9 cats placed.
D7 is the new cat for this step.
5 cats remain after this placement.
5
Step 5: Place the cat at A2
The board reaches 5/9 cats after the placement at A2.
Visual step: A2
Use this image to confirm the cat at A2, row 2, column A. Keep the earlier cats at G3, I4, F6, D7. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 5/9 cats placed.
A2 is the new cat for this step.
4 cats remain after this placement.
6
Step 6: Place the cat at C5
The board reaches 6/9 cats after the placement at C5.
Visual step: C5
Use this image to confirm the cat at C5, row 5, column C. Keep the earlier cats at G3, I4, F6, D7, A2. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 6/9 cats placed.
C5 is the new cat for this step.
3 cats remain after this placement.
7
Step 7: Place the cat at H9
The board reaches 7/9 cats after the placement at H9.
Visual step: H9
Use this image to confirm the cat at H9, row 9, column H. Keep the earlier cats at G3, I4, F6, D7, A2, C5. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 7/9 cats placed.
H9 is the new cat for this step.
2 cats remain after this placement.
8
Step 8: Place the cat at E1
The board reaches 8/9 cats after the placement at E1.
Visual step: E1
Use this image to confirm the cat at E1, row 1, column E. Keep the earlier cats at G3, I4, F6, D7, A2, C5, H9. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 8/9 cats placed.
E1 is the new cat for this step.
1 cat remains after this placement.
9
Step 9: Place the cat at B8
The board reaches 9/9 cats after the placement at B8.
Visual step: B8
Use this image to confirm the cat at B8, row 8, column B. Keep the earlier cats at G3, I4, F6, D7, A2, C5, H9, E1. This keeps the one-cat-per-row and one-cat-per-column rule intact.
Board state shows 9/9 cats placed.
B8 is the new cat for this step.
All 9 cats are now placed without sharing a row or column.
Final board image
Final screenshot source: Step 9, focused on B8.
Logic recap
Why This Solves Level 123
The final placements (E1, A2, G3, I4, C5, F6, D7, B8, H9) cover 9 rows and 9 columns exactly once. Each cat stays inside the 9x9 board and keeps the row, column, and no-touching rules intact.
Final check
Rows 1-9 each contain one cat.
Columns A-I 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.