How should the two columns be handled?

Alternate them only after the bottom turn clears, completing one receiver before moving to the opposite wall.

When does the white reserve open?

Open it after the exposed side colors have checked and the lower return has room.

Loop Sort level guide

expert 11 colors

Loop Sort Level 247 is a seven-group dual-column loop with long side queues, large blue trucks, and a white-covered lower reserve.

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Clear the opening blue and green layers around the left and right columns.
Resolve orange, white, and red from the side banks, completing each receiver before the next source opens.
Keep the bottom turn free while the yellow wave crosses the outer rail.
Open the white-covered lower reserve after the side columns check, then route its revealed color into the free receiver.
Finish purple, yellow, orange, black, and the late green and pink fragments in reveal order.
Confirm all seven groups and both side columns reach the completed state.

Colors in this level:

Blue, Green, Orange, White, Red, Yellow, Purple, Pink, Gray, Black, Brown

Filling one side receiver while the opposite side is still using the bottom turn.
Opening the white reserve before the first side checks.
Pulling several horizontal trucks into the same lower return.

Board notes 5 details

Layout: Two tall source-and-receiver columns face each other inside a long rectangular loop. Horizontal trucks stack down both sides, with large blue trucks near the upper and middle lanes and a white-covered reserve at the lower-right.
Goal: Clear seven groups through the two side columns and long bottom return, alternating checks as the outer rail changes from cyan and green to yellow, orange, and purple.
Opening: Use the exposed blue and green bands on both columns, then clear orange, white, and red before opening the white-covered reserve.
Danger Zone: The side columns share the bottom turn. A partial receiver on either side can block every later color while the lower reserve is still closed.
Mechanics: A long two-wall queue alternates side checks; the covered lower reserve and late purple, yellow, orange, green, and black layers form the final sequence.

How should the two columns be handled?
Alternate them only after the bottom turn clears, completing one receiver before moving to the opposite wall.
When does the white reserve open?
Open it after the exposed side colors have checked and the lower return has room.