@hiryus After some trial and effort I got my spawns happily adding extensions if there aren't enough yet. Can't thank you enough.

Hello, I am new to this forum and to Screeps. And I was not sure if this post belongs to the Help catagory or not.

Anyway I want my creeps to be able to add extensions to any spawn. My idea was to make a method that I can add to all spawns called 'addExtension'. So when I call Game.spawns['Spawn1'].addExtension a construction site would be placed. But I am not sure how to program this. I want the extensions to be placed in a checker pattern around the spawn. I guess the method should just go over all tiles in that checker pattern till it finds an empty space.

I hope somebody can help me with this or tell me how else I should do it

Edit: http://rein.ga/i/jHgW4.png Kind of how it should look but made from the inside out