Droid 3

From KeenWiki

Like Droid 2 this is robot was created for menial work and guard duties around the Robot Hive. This robot moves fast along vertical platforms and may smack into you if you don't look out. These droids are no serious threat, but they can get annoying. They have almost no intelligence and although it can see where it's going, often just zips about. One shot will kill, if you can hit it in time! A variety of Droidiccus.