Get 15 browns and attack the soldiers on the right until they are dead. Then let the browns kill the archers. Go to the far left corner from the entrance and kill the remaining archers with your browns. Return to exchange your browns for 40 reds and 10 blues. Put 20 reds (on a banner) on each of the two plateaus and wait until the Devourer leaves for the third part. Then, clean up the slime with the blues.
