Try to get from the first country to the destination by crossing the fewest number of international borders. Distance is no object, just your passport!
Not all paths will cross 4 borders/ use all the boxes. When you reach a country that borders your destination, the extra cells will be filled in.
Answers must correspond to the yellow box. If your entry doesn't work, it may be at the wrong step of the journey.
You should corrext Swaziland to Eswatini and add a caveat about counting borders on bridges, not just land borders, because Singapore and Malaysia are not actually connected by land.