CAMOUFLAGE [16x16]
Creeps start on the 4 segments part on the bottom and then go from circle to circle, becoming invisible in between. Because this might not be an easy task, I appended a little defense spot at the end. The spots in the middle are blocked to make it even more a challenge.
wdyt?
BTW: I reused one of morpheus' ideas posted also in this forum for the path. I really like that approach.