The goal is to find the correct sequence of puffs to push all the puffballs onto the pale-pink target squares. Click on any red puffball to trigger a single puff. All other puffballs directly in line, horizontally or vertically, with the active puffball will get pushed away by one square (unless otherwise blocked). Note, you can't push a puffball off the grid, so once it reaches an edge it is stuck there, you might be able to push it along the edge, but never pull it back from the edge. So if you end up with more puffballs than target-squares on any one edge, well... you might want to start again.