What is the key timing rule in Car Sort Level 120?

The key timing rule is to leave the basement line open until the top chimney and middle square have released the same outer wall.

Why does the box keep undoing in Level 120?

Because the lower row often closes before the center square has fully separated its blue-yellow lanes.

Car Sort level guide

Car Sort Level 120 Walkthrough

expert Target: 56 moves 7 colors

Car Sort Level 120 is a narrow roof-and-basement box where the middle square must calm down before the lower receiver line can stop sharing the same outer wall with the top chimney.

Board Notes

Layout: A single top chimney feeds a dense middle square of vertical rows, and a lower receiver line hangs under the box.
Goal: Trim the chimney first, flatten the blue-yellow center lanes second, and finish the lower row only after the outer wall belongs to the final cleanup.
Opening: Clear the top chimney, free a blue center lane, and keep the basement row flexible while the middle square is still mixed.
Danger Zone: If a basement receiver seals before the middle square releases the same wall, the chimney undoes and the center blue-yellow lanes back up.
Mechanics: This is a compressed roof-to-basement handoff. The top chimney is not the finish until the middle square has stopped borrowing its wall.

Quick Tips for Car Sort Level 120 (spoiler-free)

Trim the chimney before sealing the basement row.
Let the blue center lane clear before the lower receivers close.
Keep the middle square flexible through the pass.

How to Solve Car Sort Level 120 — Full Solution

Trim the top chimney first so the center square clears its outgoing lane through the same outer wall.
Free the first blue middle lane before the ground floor receiver line begins to finalize.
Keep the lower receivers flexible while the yellow and green center rows still borrow the wall.
Let the middle square separate into stable vertical bands before the ground floor row closes for good.
Close the lower receiver line once the top chimney and center square no longer need to reopen it.

Colors in this level:

Blue, Yellow, Green, Purple, Pink, Black, Cream

Common Mistakes to Avoid

Sealing the basement row while the blue center lane is still mixed.
Treating the top chimney like a finish before the middle square parks.

Frequently Asked Questions

What is the key timing rule in Car Sort Level 120?
The key timing rule is to leave the basement line open until the top chimney and middle square have released the same outer wall.
Why does the box keep undoing in Level 120?
Because the lower row often closes before the center square has fully separated its blue-yellow lanes.