Which purple square is correct on Level 190?

Use r7c4. The adjacent r7c3 tap is red in the source and is not a successful placement.

What happens at the upper light-green/blue-gray intersection?

The source rejects r1c3 in red, then accepts r2c5 in blue-gray after the propagation settles.

Place the tenth cat at r6c6 in the pink field; the source shows Perfect with one heart remaining.

Zoodoku level guide

expert 10 colors

Zoodoku Level 190 is an empty 10x10 cat board; follow r10c8, r9c10, r8c1, r7c4, r2c5, r1c7, r3c2, r4c9, r5c3, and r6c6, avoiding red r7c3 and r1c3.

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Place the first cat at r10c8 in the single brown cell; its bottom-row white-X cascade starts here.
Place the second cat at r9c10 in the teal lower-right territory.
Place the third cat at r8c1 in the green lower-left territory.
Skip red r7c3, then place the fourth cat at r7c4 in the purple territory.
Skip the later red r1c3 probe, then place the fifth cat at r2c5 in the blue-gray territory.
Place the sixth cat at r1c7 in the light-green top band.
Place the seventh cat at r3c2 in the mauve territory.
Place the eighth cat at r4c9 in the yellow right-side territory.
Place the ninth cat at r5c3 in the orange lower-left band.
Finish with the tenth cat at r6c6 in the pink central field, then confirm Perfect.

Colors in this level:

Mauve, Light-green, Yellow, Orange, Blue-gray, Pink, Purple, Green, Teal, Brown

Do not tap r7c3: it is the red failed purple probe, while the accepted adjacent purple square is r7c4.
Do not tap r1c3: it is the red light-green probe, while the accepted upper blue-gray square is r2c5.

Start at brown r10c8, then take teal r9c10 and green r8c1 before choosing purple r7c4; skip red r7c3.
After the long propagation, skip red r1c3 and use blue-gray r2c5; the final accepted order is r1c7, r3c2, r4c9, r5c3, r6c6.

Board notes 5 details

Layout: The 10x10 board has mauve/light-green/yellow at the top, orange and blue-gray through the upper-left center, a long pink central field, purple in the lower-left bend, green at the bottom-left, teal along the lower-right, and a single brown r10c8 cell.
Goal: Use the verified ten-cat order r10c8, r9c10, r8c1, r7c4, r2c5, r1c7, r3c2, r4c9, r5c3, and r6c6 to cover the board's ten colored territories.
Opening: The pre-tap board has no cat and no white X. The first brown r10c8 placement produces the bottom-row logical-X cascade; the later white marks are propagated row, column, territory, and neighbor exclusions.
Danger Zone: The source records red r7c3 immediately before accepted purple r7c4, then red r1c3 before accepted blue-gray r2c5. Both are failed probes and the final HUD retains one heart.
Mechanics: This is a ten-cat 10x10 board with a single-cell brown start, a long pink field, two close false squares, and a final Perfect state with one heart remaining.

Which purple square is correct on Level 190?
Use r7c4. The adjacent r7c3 tap is red in the source and is not a successful placement.
What happens at the upper light-green/blue-gray intersection?
The source rejects r1c3 in red, then accepts r2c5 in blue-gray after the propagation settles.
What is the final Level 190 placement?
Place the tenth cat at r6c6 in the pink field; the source shows Perfect with one heart remaining.