For this year’s Halloween Party 2011, Club Penguin has a new stamp: Trick or Treat stamp! It’s easy! Simply visit at least 10 igloos of the new Trick or Treat igloo (the new igloo of a street with 3 igloos).
Tip: Try to log in popular servers (with 4 or 5 bars) there you will be more likely to see open igloos on map.
Also, only a few have noticed the once-members-only Halloween stamp released last year’s Halloween Party now seems to be also for non-members! I earned this stamp by wearing pirates items from Rockhopper and the Ghost Sheet! Try it out yourself and try different clothings and tell us what you wore to earn the stamp at the comments below!