Are any penguins seeded on Level 187?

No. The first board view is empty; r7c5 is the first accepted placement and the first source penguin.

Which blue square should be used after the red probe?

Use r4c4. The tempting r2c4 probe is red in the source and is not a successful placement.

The ninth penguin goes at r6c1 in the brown territory, producing the Perfect state with two hearts remaining.

Zoodoku level guide

expert 9 colors

Zoodoku Level 187 is an empty 9x9 penguin board; place penguins at r7c5, r8c3, r1c2, r4c4, r2c6, r9c7, r5c8, r3c9, and r6c1, avoiding red r2c4.

If the player asks you to sign in, open the video on YouTube instead.

Place the first penguin at r7c5 in the single pink cell.
Place the second penguin at r8c3 in the single yellow cell.
Place the third penguin at r1c2 in the single light-green cell.
Skip red r2c4, then place the fourth penguin at r4c4 in the blue territory.
Place the fifth penguin at r2c6 in the green upper-center territory.
Place the sixth penguin at r9c7 in the teal lower-right strip.
Place the seventh penguin at r5c8 in the purple pocket.
Place the eighth penguin at r3c9 in the mauve right edge.
Finish with the ninth penguin at r6c1 in the brown lower-left territory, then confirm Perfect.

Colors in this level:

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

Do not tap r2c4: the video records it as a red failed blue-region probe.
Do not replace the accepted blue r4c4 with the upper r2c4 cell; the lower square is the reproducible route.

Take the isolated pink r7c5, yellow r8c3, and light-green r1c2 before resolving the central blue lane.
After r1c2, skip red r2c4 and use blue r4c4; the verified close is r5c8, r3c9, then brown r6c1.

Board notes 5 details

Layout: The 9x9 opening has a brown lower-left mass, blue lanes through the upper center, green at the top center, mauve across the right, and single-cell light-green r1c2, pink r7c5, and yellow r8c3 territories.
Goal: Use the verified source order r7c5, r8c3, r1c2, r4c4, r2c6, r9c7, r5c8, r3c9, and r6c1 to cover the nine territories.
Opening: No penguin or white X is visible before the first tap. The accepted pink r7c5 starts the white-X propagation; subsequent marks close rows, columns, territories, and eight-neighbor cells.
Danger Zone: The source probes r2c4 red in the blue network after r1c2. The accepted blue target is the lower r4c4, and the failed probe costs one heart.
Mechanics: This is a nine-penguin 9x9 board with three single-cell targets, one red blue-region probe, and a final Perfect state with two hearts remaining.

Are any penguins seeded on Level 187?
No. The first board view is empty; r7c5 is the first accepted placement and the first source penguin.
Which blue square should be used after the red probe?
Use r4c4. The tempting r2c4 probe is red in the source and is not a successful placement.
What completes Level 187?
The ninth penguin goes at r6c1 in the brown territory, producing the Perfect state with two hearts remaining.