To qualify to log this cache then you must have found and logged 20 distinct caches which have a word or words in the cache name which can be used associated with Halloween.
So we are looking for caches containing words like skull, ghost, witch, ghoul, scare, black, cat, magic, sleepy hollow, cemetery, chain, troll, monster, devil, imp, etc.
Caches can be found at any time, and it doesn't matter if they're still active or have been archived. Any cache type can be used (even earthcaches and event).
Just dont use same word or cache twice - no plurals. But something like death and dead are OK as death can refer to Death - the bones with the scythe. Oh and no changing the names of archived Highland Haggi caches!
You can sign the log in the cache for this challenge at any time and log a 'note' to the cache page, mentioning you signed the log.
But you may not log a find until you have completed the requirements (this way you don't have to go back to sign after you complete the requirements!).
Once you complete the requirements, edit your log, change it to found, and change the find date to the date you completed the requirements and list the required information.
For example, here are my 20....
Witch - Witchcraig walk on 29/Feb/2004 - http://coord.info/GCC8E3
Devil - The Devil's Wood on 01/May/2004 - http://coord.info/GCH3F4.
Bram Stoker - Bram Stokers Whitby Cache on 21/Sep/2004 - http://coord.info/GCHQ994.
Grave - Sailor's Grave on 17/Jun/2007 - http://coord.info/GC10GRA4.
Jekyll and Hide - Father to Jekyll & Hyde on 28/Jun/2008 - http://coord.info/GC196YK4.
Troll - Troll Under the Bridge on 24/Jan/2009 - http://coord.info/GC1BHG7
Magic - Arran - Manchester Magic on 21/Apr/2009 - http://coord.info/GCG6KH
Dead - Dead Centre of Carnwath on 14/Jun/2009 - http://coord.info/GC14NFG
Tomb - Tombs Of The Seven Pharaohs on 21/Jun/2009 - http://coord.info/GC1TY3T
Night - Dune Tides Night Cache on 07/Aug/2009 - http://coord.info/GCZ953
Death - The Death of Power on 17/May/2010 - http://coord.info/GCJ3TZ
Bones - Dem Bones on 21/Aug/2010 - http://coord.info/GC2CCRB
Spooky - The Spooky Steps on 30/Oct/2010 - http://coord.info/GC2HDC6
Ghoul - Grabbed by the ghoulies - The well of lost souls on 30/Oct/2010 - http://coord.info/GC2H1KE
Ghost - Ghost Horse on 01/Nov/2010 - http://coord.info/GC2HDCN
Gallows - Gallows Hill on 25/Feb/2011 - http://coord.info/GC29RM4
Blood - Blood Island on 21/Aug/2011 - http://coord.info/GC108JY
Hobgoblin - Hobgoblin's Revenge - The Unsuitable Container on 04/Sep/2011 - http://coord.info/GC32RQ5
Sleepy Hollow - Sleepy Hollow on 26/Feb/2012 - http://coord.info/GC3D3Q4
Hanging - Mugdock May-hem: The Hanging on 08/May/2012 - http://coord.info/GC3G87Z