Find a cache a day for 500 consecutive days
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ID - "Cache Addict" 500 Day Challenge (GC3Q4VJ)

"Cache Addict" 500 Day Challenge

Find a cache a day for 600 consecutive days
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ID - "Cache Addict" 600 Day Challenge

"Cache Addict" 600 Day Challenge

Find 16 caches that contain the words WELCOME TO in their titles
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ID - "Sweet Sixteen Challenge" - A Welcoming Cache (GC37WAR)

"Sweet Sixteen Challenge" - A Welcoming Cache

Find 5 caches with a D/T rating of X / 5.0

ID - 001 ICS - Terrain 5 by 5 Challenge (GC3TTKZ)

001 ICS - Terrain 5 by 5 Challenge

Find 10 caches with a D/T rating of X / 5.0

ID - 002 ICS- Terrain 10 by 5 Challenge (GC3TTP5)

002 ICS- Terrain 10 by 5 Challenge

Find 5 caches with a D/T rating of X / 4.5

ID - 003 ICS- Terrain 5 by 4.5 Challenge (GC3TTP8)

003 ICS- Terrain 5 by 4.5 Challenge

Find 10 caches with a D/T rating of X / 4.5

ID - 004 ICS - Terrain 10 by 4.5 Challenge (GC3TTPG)

004 ICS - Terrain 10 by 4.5 Challenge

Find 5 caches with a D/T rating of 5.0 / X

ID - 005 ICS - Difficulty 5 by 5 Challenge (GC3TTPQ)

005 ICS - Difficulty 5 by 5 Challenge

Find 10 caches with a D/T rating of 5.0 / X

ID - 006 ICS - Difficulty 10 by 5 Challenge (GC3TTPX)

006 ICS - Difficulty 10 by 5 Challenge

Find 50 different caches with the name of an animal in the title

ID - 007 ICS - Animal Crackers Challenge (GC3TTQ6)

007 ICS - Animal Crackers Challenge

ID - 008 ICS - Finds 2000 - 2001 Challenge (GC3TV2Z)

008 ICS - Finds 2000 - 2001 Challenge

Have 10 Souvenirs in your geocaching profile

ID - 013 ICS - Souvenirs by 10 Challenge (GC3TV4B)

013 ICS - Souvenirs by 10 Challenge

ID - 014 ICS - Virtual by 25 Challenge (GC3TV4H)

014 ICS - Virtual by 25 Challenge

ID - 015 ICS - Virtual by 50 Challenge (GC3TV4R)

015 ICS - Virtual by 50 Challenge

ID - 016 ICS - Virtual by 100 Challenge

016 ICS - Virtual by 100 Challenge

ID - 017 ICS - Earth by 25 Challenge (GC3TV5C)

017 ICS - Earth by 25 Challenge

ID - 018 ICS - Earth by 50 Challenge

018 ICS - Earth by 50 Challenge

ID - 019 ICS - Earth by 100 Challenge (GC3TV63)

019 ICS - Earth by 100 Challenge

ID - 020 ICS - Date Challenge - January (GC3V3NG)

020 ICS - Date Challenge - January

ID - 021 ICS - Date Challenge - February (GC3V3NX)

021 ICS - Date Challenge - February

Caches, for U.S. States ID - MD, that require you to find a certain number of other caches that meet specific criteria (plus a few exceptions.) Difficulty of the task varies.

See [url=http://coord.info/PR1DXMJ]my profile[/url] for additional U.S. Challenge Bookmark Lists

Help me keep it up to date by suggesting additions or corrections - [url=http://www.geocaching.com/email/?guid=92ceee60-5648-4432-b2aa-10069fb40ac7]Email me[/url] or rate the list.
Last updated 06/11/2013

U.S. Challenge Caches: States ID - MD.list-details-1wr9x6v{text-transform:uppercase;font-size:12px;}@media screen and (min-width: 600px){.list-details-1wr9x6v{font-size:1.25rem;}}.list-details-1wr9x6v.shareable{color:#87705a;}.list-details-1wr9x6v.public{color:#00b265;}Public

U.S. Challenge Caches: States ID - MDPublic