A Guide to Patterns and Forms in Trainyard
In the previous section, we saw how the Molehill could be used to merge cars that are separated by two squares. To merge cars separated by four, six, or more squares, you can increase the size of the Molehill (i.e. make a mountain out of it), as follows:
This, however, is an egregious waste of track, and it may not even be possible in certain space-strapped puzzles. A loop is sometimes a better option:
Unlike the Molehill, the Loop won't break down if another car appears between the two cars you hope to merge. However, it will delay the merged car, which may not be a problem unless you're hoping to create the shortest-running solution (and the delay can be easily fixed using a switch before or during the loop).
Longer loops can also be used to merge cars that are six or eight squares apart.
As I said earlier, if you've played Trainyard for any amount of time, you've probably already used the Loop and the Molehill effectively. But you may not know how to put them together to create a new form, which I have lovingly named "The Combine".
Next: The Combine