A 8x8 board rated fiendish, level 223 of 300. Catdoku levels are identical for every player, so this solution always matches the board in your game.
The level 223 board
Place one cat in every row, every column and every colored patch. No two cats may touch, not even diagonally.
Level 223 answer
Row 1: column 6, in the yellow patch
Row 2: column 8, in the sky patch
Row 3: column 5, in the rose patch
Row 4: column 1, in the mint patch
Row 5: column 3, in the lilac patch
Row 6: column 7, in the peach patch
Row 7: column 4, in the aqua patch
Row 8: column 2, in the coral patch
How to solve level 223, 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).
Every free square of the mint patch sits in row 4, so the mint cat must come from there and the rest of row 4 can be crossed out. Every free square of the aqua patch sits in row 7, so the aqua cat must come from there and the rest of row 7 can be crossed out. A cat at row 3, column 1 would leave row 4 with no home for its cat, so cross that square out. A cat at row 3, column 2 would leave row 4 with no home for its cat, so cross that square out. A cat at row 5, column 1 would leave row 4 with no home for its cat, so cross that square out. A cat at row 5, column 2 would leave row 4 with no home for its cat, so cross that square out. A cat at row 6, column 2 would leave the lilac patch with no home for its cat, so cross that square out. Every free square of the coral patch sits in row 8, so the coral cat must come from there and the rest of row 8 can be crossed out. A cat at row 6, column 3 would leave row 7 with no home for its cat, so cross that square out. A cat at row 6, column 4 would leave row 7 with no home for its cat, so cross that square out. A cat at row 8, column 3 would leave row 7 with no home for its cat, so cross that square out. The mint and coral patches all squeeze into columns 1 and 2, so those columns are reserved for them; every other square there can be crossed out. Cat 1 of 8: the lilac patch is down to a single free square at row 5, column 3, so its cat settles there.
Cat 2 of 8: the mint patch is down to a single free square at row 4, column 1, so its cat settles there.
Cat 3 of 8: the aqua patch is down to a single free square at row 7, column 4, so its cat settles there.
Cat 4 of 8: the coral patch is down to a single free square at row 8, column 2, so its cat settles there.
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. Every free square of the rose patch sits in column 5, so the rose cat must come from there and the rest of column 5 can be crossed out. Cat 5 of 8: the yellow patch is down to a single free square at row 1, column 6, so its cat settles there.
Cat 6 of 8: the rose patch is down to a single free square at row 3, column 5, so its cat settles there.
Cat 7 of 8: the sky patch is down to a single free square at row 2, column 8, so its cat settles there.
Cat 8 of 8: the peach patch is down to a single free square at row 6, column 7, so its cat settles there.