Gem on bottom left of world editor?

Level 6
Joined
Nov 14, 2010
Messages
248
Hello members of the Hive do any of you know what this little gem in the corner of world editor is? If so please tell me thank you.
mwa88x.jpg
 
Level 11
Joined
Jul 9, 2009
Messages
926
randomly too, it can play mortar's voice (I Think) saying "Is that the best you can do ?"
 
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