Car Sort: Color Puzzle Level 451 Solution Walkthrough
Route Reference
Key opening, middle, and finish positions for this route.

Read The Small Rectangle
The opening layout shows red, blue, purple, yellow, orange, and green in compact columns. The road loops around the small upper rectangle and then feeds the lower row. Because the level is short, there is not much room for recovery if two colors are mixed.
Use this route reference:
top red -> blue and purple center -> yellow bottom-middle -> orange lower-right -> green final column
The order is mainly about keeping the rectangle empty. Finish the current visible group before moving to the next column.
Clear The Top First
Start with the top red group. It opens the first lane and reduces the visible counter quickly. Blue and purple then become safe in the center. Move each color as a complete batch. If blue is still on the road, do not start purple yet.
The first checkpoint should show the top area dark and the lower columns exposed. At that point the level is nearly in cleanup mode.
Use The Bottom Columns
Yellow in the lower-middle is the next practical release. It has a direct route through the small road. Orange follows from the lower-right. Green is best saved for the final move because it uses the last open lane and does not need to unlock much else.

The video reaches completion quickly, so the route does not show many alternate states. If your board differs, rebuild from the visible road: finish the color already traveling, then choose the complete column closest to the road entrance.
Recovery Notes
If the small rectangle blocks, do not tap a new bottom color. Complete red, blue, or purple first. If the lower row blocks, finish yellow or orange before green. Level 451 is short, but it still follows the same rule as the longer stages: one full color at a time.