The hard puzzle at Level 3991 puts you among the highest levels in Crowd Express, reserved for the most dedicated players. Passengers need to reach the correct vehicles, and the margin for error is smaller than it looks.
If a group of passengers is sandwiched between two others, clear the outer groups first to give them room.
Every board arrangement can differ slightly. If this solution does not line up with yours, try the screenshot solver for a more precise match.
This reference page helps you verify the right walkthrough for your board. If your layout looks different, the solver can match your exact arrangement.
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