Which number belongs on the sad square?

Drag 4 onto it because a square has four sides.

Which number belongs on the six-sided shape?

Drag 6 onto it because the outline has six sides.

Nothing in the demonstrated solution; leave it as the decoy.

No. The triangle, square, and pentagon examples are already correct; only the two sad shapes below need numbers.

Brain Test 4 level guide

easy 4 colors

Brain Test 4 Level 319 makes the two sad shapes happy by assigning 4 to the square and 6 to the hexagon-like shape.

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Locate the sad square and the sad hexagon-like shape in the lower row.
Press and hold the bottom number 4.
Drag 4 onto the sad square and release it.
Press and hold the bottom number 6.
Drag 6 onto the sad six-sided shape and release it.
Leave 2 alone and wait for both shapes to turn happy and for the green completion state.

Colors in this level:

Red, White, Black, Green

Board notes 5 details

Layout: Happy triangle, square, and pentagon examples are labeled 3, 4, and 5; a sad square and sad hexagon-like shape sit below with bottom choices 4, 6, and 2.
Goal: Match each sad shape with the number of sides in its outline.
Opening: Press and hold the bottom 4 and drag it to the sad square.
Danger Zone: The bottom 2 is a decoy; do not swap 4 and 6 or disturb the already happy examples.
Mechanics: Dragging the correct side-count number onto a sad shape changes its face to a smile and consumes that number.

Which number belongs on the sad square?
Drag 4 onto it because a square has four sides.
Which number belongs on the six-sided shape?
Drag 6 onto it because the outline has six sides.
What is the 2 for?
Nothing in the demonstrated solution; leave it as the decoy.
Do I need to change the happy examples at the top?
No. The triangle, square, and pentagon examples are already correct; only the two sad shapes below need numbers.