Kevin HY Hau - Hello World 👋

How to play: lay one single rail line from the blue entry to the green exit, drawn on the edge of the board. The numbers at the side and top say how many squares of track that row or column holds. The line never crosses or touches itself in one square, turns at right angles and passes through every pre-placed piece the way it points. Tap or drag to mark squares as track (brown); use ✖ No track (or right-click, or Shift) for squares you know are empty. Rows and columns turn green when they are right and red if they hold too much. Pieces join up by themselves when a square has only two possible neighbours. Hint fills in one square (and counts), Check flashes your mistakes. When the track is complete, a train rides along it!