How do I make the long residential building in Level 306?

Break the turquoise house's pink roof with the hammer, place the white building on it, and place the yellow house on top.

Do I need to use the bulldozer?

No. The bulldozer is a construction-themed decoy; the hammer and three houses are the solution objects.

Use the turquoise house as the base, the white two-window building in the middle, and the yellow house at the top.

Brain Test 4 level guide

medium 8 colors

Brain Test 4 Level 306 removes the turquoise house roof, then stacks the white and yellow houses vertically to make the long residential building.

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Locate the turquoise house with the pink trapezoid roof on the far left.
Press and drag the construction hammer from the lower-left street onto the pink roof.
Wait for the impact to remove the roof and leave the turquoise house flat-topped.
Drag the small white building with two blue windows from the center onto the turquoise base.
Drag the yellow right-hand house onto the top of the white section.
Release it and wait for the green check and the message about not living in that building.

Colors in this level:

Teal, Pink, Gray, White, Blue, Yellow, Brown, Black

Using the bulldozer because it is the largest construction object.
Stopping after removing the turquoise roof without placing the other two houses.
Leaving the white building beside the base or releasing the yellow house on the street instead of stacking it.

Board notes 5 details

Layout: A turquoise one-story house with a pink roof stands left of a small white two-window building and a yellow house; a hammer lies on the street and a bulldozer sits by the right house.
Goal: Remove the turquoise roof and build upward by placing the white building on the turquoise base and the yellow house on top.
Opening: Drag the construction hammer from the lower-left street onto the pink roof of the turquoise house.
Danger Zone: The bulldozer is a decoy, and stopping after the roof breaks or leaving a building beside the base does not create the required stack.
Mechanics: A roof-breaking transition turns the left house into a base, after which whole houses can be dragged into a strict bottom-to-top stack.

How do I make the long residential building in Level 306?
Break the turquoise house's pink roof with the hammer, place the white building on it, and place the yellow house on top.
Do I need to use the bulldozer?
No. The bulldozer is a construction-themed decoy; the hammer and three houses are the solution objects.
What order should the houses use?
Use the turquoise house as the base, the white two-window building in the middle, and the yellow house at the top.