What is the safe opening for Level 31?

Use the green opening first, then the orange and blue buses that reach the exposed U bands.

Why not pick any visible color from the diagonal queue?

A visible color can still be blocked behind the reshaping U; choose the bus that reaches the currently exposed passenger group.

Bus Fever Party level guide

hard 9 colors

Green 12 is the first bus in the row, then orange 28 and blue 4. Buses whose passengers are still behind the U are the ones that stall this level.

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Dispatch the exposed green bus with the visible 12 counter and let its first departure create room.
Take the orange bus for the reachable outer band, then the blue bus with the visible 4 counter for the lower blue and cyan bend.
Follow the next green and pink groups as the holding row releases; the pink bus enters with 16.
Work through the reshaped upper pocket with yellow and purple matches while preserving a regular bay for the next blue or cyan departure.
Clear the red, orange, brown, and remaining cyan and green bands from newly exposed queue positions instead of using a blocked same-color bus.
Finish the small green and cyan tail, then wait for the route to empty.

Colors in this level:

Blue, Brown, Cyan, Green, Orange, Pink, Purple, Red, Yellow

Choosing a matching-color bus whose passenger block is still trapped behind the U.
Filling the regular bays while the current green or blue boarding counter is still active.

Start with the green 12 opening, then use orange and blue when their outer bands are reachable.
Keep one regular bay available while the U is changing shape.
Follow exposed passenger blocks instead of tapping the nearest diagonal-queue bus.

Board notes 5 details

Layout: A deep U-shaped route reshapes through orange, cyan, pink, blue, purple, yellow, green, red, and brown passenger bands. The lower queue is a dense diagonal field of directional buses with a small numbered bus mixed into the visible colors.
Goal: Use the green, orange, and blue opening to create departures, then keep the lower blue, purple, and yellow bend reachable until the route contracts to the cyan-green tail.
Opening: The holding row opens with green 12; the next states add orange 28 and blue 4 as the upper and lower U bands open.
Danger Zone: Selecting a visible same-color bus whose passenger block is still behind the U fills a bay while the green and blue departure chain is active, causing a board stall.
Mechanics: The deep U cycles through nine colors, and the green and blue departure chain in the middle is the stretch where the row is most crowded.

What is the safe opening for Level 31?
Use the green opening first, then the orange and blue buses that reach the exposed U bands.
Why not pick any visible color from the diagonal queue?
A visible color can still be blocked behind the reshaping U; choose the bus that reaches the currently exposed passenger group.