The standard-difficulty puzzle at Level 1637 puts you a late-game level that demands strong pattern recognition and planning. Passengers need to reach the correct vehicles, and the margin for error is smaller than it looks.
When two groups need the same lane, let the shorter group cross first to free up space sooner.
Board layouts can vary between attempts. Head to the solver if you need a match for a different arrangement of this level.
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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