Catdoku level 1666 answer and walkthrough

The level 1666 board

Place one cat in every row, every column and every colored patch. No two cats may touch, not even diagonally.

Level 1666 answer

1. Row 1: column 3, in the yellow patch
2. Row 2: column 9, in the sky patch
3. Row 3: column 1, in the rose patch
4. Row 4: column 5, in the mint patch
5. Row 5: column 2, in the lilac patch
6. Row 6: column 10, in the peach patch
7. Row 7: column 8, in the aqua patch
8. Row 8: column 6, in the coral patch
9. Row 9: column 4, in the lime patch
10. Row 10: column 7, in the periwinkle patch

How to solve level 1666, step by step

After every placed cat, cross out the rest of its row, its column, its patch and the four corner squares around it. The steps below assume you do (the in-game auto-paws assist does it for you).

1. Cat 1 of 10: the peach patch is down to a single free square at row 6, column 10, so its cat settles there.
2. Every free square of the periwinkle patch sits in row 10, so the periwinkle cat must come from there and the rest of row 10 can be crossed out. A cat at row 2, column 8 would leave row 1 with no home for its cat, so cross that square out. A cat at row 4, column 4 would leave the mint patch with no home for its cat, so cross that square out. A cat at row 5, column 6 would leave the mint patch with no home for its cat, so cross that square out. A cat at row 8, column 8 would leave the aqua patch with no home for its cat, so cross that square out. A cat at row 8, column 9 would leave the aqua patch with no home for its cat, so cross that square out. A cat at row 9, column 6 would leave row 10 with no home for its cat, so cross that square out. A cat at row 9, column 8 would leave the aqua patch with no home for its cat, so cross that square out. The aqua, coral and lime patches all squeeze into rows 7, 8 and 9, so those rows are reserved for them; every other square there can be crossed out. Cat 2 of 10: the lilac patch is down to a single free square at row 5, column 2, so its cat settles there.
3. Cat 3 of 10: the mint patch is down to a single free square at row 4, column 5, so its cat settles there.
4. A cat at row 1, column 4 would leave column 3 with no home for its cat, so cross that square out. A cat at row 2, column 1 would leave column 3 with no home for its cat, so cross that square out. A cat at row 2, column 4 would leave column 3 with no home for its cat, so cross that square out. Column 4 only has free squares inside the lime patch, so that patch's cat is spoken for and its squares outside the line can be crossed out. A cat at row 2, column 6 would leave column 3 with no home for its cat, so cross that square out. A cat at row 2, column 7 would leave column 3 with no home for its cat, so cross that square out. A cat at row 3, column 3 would leave column 1 with no home for its cat, so cross that square out. A cat at row 3, column 8 would leave column 1 with no home for its cat, so cross that square out. A cat at row 1, column 9 would leave the yellow patch with no home for its cat, so cross that square out. A cat at row 3, column 9 would leave column 1 with no home for its cat, so cross that square out. Every free square of the yellow patch sits in row 1, so the yellow cat must come from there and the rest of row 1 can be crossed out. Cat 4 of 10: column 8 has exactly one square left, at row 7, so the cat goes there.
5. Cat 5 of 10: column 9 has exactly one square left, at row 2, so the cat goes there.
6. Cat 6 of 10: the rose patch is down to a single free square at row 3, column 1, so its cat settles there.
7. Cat 7 of 10: column 3 has exactly one square left, at row 1, so the cat goes there.
8. A cat at row 9, column 7 would leave row 10 with no home for its cat, so cross that square out. Cat 8 of 10: the coral patch is down to a single free square at row 8, column 6, so its cat settles there.
9. Cat 9 of 10: the lime patch is down to a single free square at row 9, column 4, so its cat settles there.
10. Cat 10 of 10: the periwinkle patch is down to a single free square at row 10, column 7, so its cat settles there.