Is the red web a new nest when its number changes?

No. Its 10-to-5 change is an active blocker/remainder state on the board; a fresh nest appears only in a lane released by the previous group.

When is the green car actually finished?

Only after the remaining chassis, driver, and outline fragments drain and the board and trays reach the empty frame.

Food Hunt: Pixel Puzzle level guide

hard 15 colors

Clear the purple-and-dark opening around the green car, track the red web from 10 to 5, and save a lane for the late chassis and driver fragments.

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Start white 4, yellow 25, black 30, and purple 21, leaving the initially open fifth lane for a released front-row card.
Let the purple/yellow/black groups drain through their active remainders, then follow the fresh teal, white, pink, and green groups as lanes clear.
Track the red web/locked tile as it falls from 10 to 5; do not treat that in-place counter change as a fresh red nest.
Clear the teal/blue, green, white, gray, and pink groups that expose the car's body and lower chassis, while preserving a lane for the remaining red pixels.
Follow the late yellow, orange, brown, purple, black, and pale details around the driver and upper car silhouette.
Wait through the final small remainders until all five trays are empty and the board is blank, then confirm the completion card.

Colors in this level:

Green, Purple, Magenta, White, Yellow, Black, Teal, Cyan, Blue, Pink, Gray, Orange, Red, Brown, Pale

Clicking ahead because an occupied tray's number changed, instead of waiting for the tray to release.
Treating the red web's 10-to-5 counter change as a fresh nest or assuming it has cleared the board.
Filling all five lanes with repeated purple, white, or yellow groups before the green chassis and late red pixels are exposed.

Use the open fifth lane, but do not fill every lane with repeated purple, white, and yellow groups before the car's lower colors expose.
Treat the red web's 10-to-5 change as an active blocker, not as a new nest.
Wait for ants to travel and all trays to release before judging the sparse car silhouette complete.

Board notes 5 details

Layout: A green car and driver-like figure sit beneath a purple/magenta upper field, with white bodywork, a yellow top, and dark center pixels. The opening row is white 4, yellow 25, black 30, purple 21, and an open fifth lane; a red web/locked tile marked 10 overlays the upper-left area.
Goal: Remove the purple field and dark center, then clear the car's white body, green lower chassis, yellow top, teal/blue accents, and the late pink, gray, orange, and red details.
Opening: Start white 4, yellow 25, black 30, and purple 21, then let the front row refresh through purple/yellow/black, teal, white, pink, and green groups. The red web counter visibly falls from 10 to 5 while the board opens.
Danger Zone: All five lanes are usable, but repeated purple, white, and yellow groups can fill them while the green chassis or web-controlled red pixels are still hidden.
Mechanics: A changing count in an occupied tray is an active remainder. The red web's 10-to-5 change is an in-place blocker state, not a fresh nest; a fresh nest is exposed only after a lane clears and releases.

Is the red web a new nest when its number changes?
No. Its 10-to-5 change is an active blocker/remainder state on the board; a fresh nest appears only in a lane released by the previous group.
When is the green car actually finished?
Only after the remaining chassis, driver, and outline fragments drain and the board and trays reach the empty frame.