What are the two area-6 rectangles?

They are r6c2:r7c4 for r7c2=6 and r5c5:r7c6 for r7c5=6.

Where does r8c5=2 go?

It occupies the bottom pair r8c5:r8c6, immediately left of the right area-4 wall.

Fourteen rectangles cover all 56 cells in the persistent 8x7 solution.

MeowBlock! level guide

medium Target: 14 moves 10 colors

Solve MeowBlock! Level 39 by securing the lower-right 4/2 pair, fitting the two area-6 rectangles, and closing the stacked area-5 bars.

Anchor r6c7=4 and drag to r5c7, committing r5c7:r8c7 as a 4x1 rectangle with area 4.
Anchor r8c5=2 and drag to r8c5, committing r8c5:r8c6 as a 1x2 rectangle with area 2.
Anchor r7c5=6 and drag to r5c5, committing r5c5:r7c6 as a 3x2 rectangle with area 6.
Anchor r7c2=6 and drag to r6c2, committing r6c2:r7c4 as a 2x3 rectangle with area 6.
Anchor r8c3=4 and drag to r8c1, committing r8c1:r8c4 as a 1x4 rectangle with area 4.
Anchor r6c1=3 and drag to r5c1, committing r5c1:r7c1 as a 3x1 rectangle with area 3.
Anchor r5c3=3 and drag to r5c2, committing r5c2:r5c4 as a 1x3 rectangle with area 3.
Anchor r4c3=5 and drag to r4c1, committing r4c1:r4c5 as a 1x5 rectangle with area 5.
Anchor r3c3=5 and drag to r3c1, committing r3c1:r3c5 as a 1x5 rectangle with area 5.
Anchor r3c6=4 and drag to r3c6, committing r3c6:r4c7 as a 2x2 rectangle with area 4.
Anchor r2c2=4 and drag to r2c1, committing r2c1:r2c4 as a 1x4 rectangle with area 4.
Anchor r2c6=3 and drag to r2c5, committing r2c5:r2c7 as a 1x3 rectangle with area 3.
Anchor r1c1=2 and drag to r1c1, committing r1c1:r1c2 as a 1x2 rectangle with area 2.
Finish with r1c5=5 at r1c3:r1c7, a 1x5 rectangle with area 5.

Colors in this level:

Green, Orange, Lavender, Cyan, Pink, Yellow, Purple, Blue, Red, Lime

Do not let the r7c5=6 block expand down to r8c6; that captures the r8c5=2 clue.
Do not shift r7c2=6 rightward; r6c2:r7c4 is the only placement that leaves the lower-left 3 and bottom 4 legal.
Do not merge the row-3 and row-4 area-5 bars; they are separate one-row rectangles r3c1:r3c5 and r4c1:r4c5.

Fix r5c7:r8c7 and r8c5:r8c6 first to make the lower-right boundary unambiguous.
Place r6c2:r7c4 and r5c5:r7c6 as separate area-6 blocks; do not let them overlap the bottom 2.
Finish the top with r1c1:r1c2, r1c3:r1c7, r2c1:r2c4, and r2c5:r2c7.

Board notes 5 details

Layout: 8 rows by 7 columns, 56 cells. Clues: r1c1=2, r1c5=5, r2c2=4, r2c6=3, r3c3=5, r3c6=4, r4c3=5, r5c3=3, r6c1=3, r6c7=4, r7c2=6, r7c5=6, r8c3=4, and r8c5=2. No unknown clues appear.
Goal: Partition all 56 cells into fourteen rectangles: r1c1:r1c2 for area 2, r1c3:r1c7 for area 5, r2c1:r2c4 for area 4, r2c5:r2c7 for area 3, r3c1:r3c5 for area 5, r3c6:r4c7 for area 4, r4c1:r4c5 for area 5, r5c2:r5c4 for area 3, r5c1:r7c1 for area 3, r5c7:r8c7 for area 4, r6c2:r7c4 for area 6, r5c5:r7c6 for area 6, r8c1:r8c4 for area 4, and r8c5:r8c6 for area 2.
Opening: The short run starts with the right area-4 wall and bottom area-2 pair, then commits the two area-6 rectangles, the bottom area-4 strip, and the left area-3 column. The row-4 and row-3 area-5 bars precede the final top 2/5 and 4/3 pair.
Danger Zone: Do not use r6c5:r8c6 for r7c5=6: it captures the separate r8c5=2 clue. The accepted area-6 block is r5c5:r7c6. Keep the other area-6 block at r6c2:r7c4 so the lower-left corridor remains rectangular.
Mechanics: This compact board interlocks two area-6 rectangles with two adjacent area-5 bars. The video includes transient lower-right previews, so the final color persistence and exact bounds are the authority.

What are the two area-6 rectangles?
They are r6c2:r7c4 for r7c2=6 and r5c5:r7c6 for r7c5=6.
Where does r8c5=2 go?
It occupies the bottom pair r8c5:r8c6, immediately left of the right area-4 wall.
How many rectangles solve Level 39?
Fourteen rectangles cover all 56 cells in the persistent 8x7 solution.