This is an example of a spiral galaxy starting grid. We have been given our galaxy centers, and a
completely blank grid.
The first step with a starting spiral galaxy puzzle is to mark out the center cells for each galaxy. You
will notice that there are 3 possible placings for each galaxy center,
The galaxy center is in the middle of a cell. In this case we can only mark that cell
as belonging to that galaxy - we can make any conclusions (yet) about which surrounding cells
might be in that galaxy.
The galaxy center is straddling two cells. In this case we know that both these cells make
up that galaxy 'core'
The galaxy center is straddling four cells. In this case we know that all four cells make
up that galaxy 'core'.
The first thing we will do is to mark out all of these galaxy centers. We do this by clicking/tapping
on the grid lines.