The new space transitioning system is pretty simple. Instead of the old random jump between z-levels, it now operates on a grid. To put this visually, imagine a torus.

The Grid

A grid might look like this:

1 | 3 | 4 7 | 5 | 6

The numbers represent the z-level, with 1 being the station. Travelling horizontally wraps around, e.g. going west from z 1 lands you on z 6. However, travelling vertically does not wrap and travelling north from z 3 will land you on z 5.

Templates

Templates may spawn on zs 3, 4 and 7.