This is an item that perhaps belongs in the Puzzle Creator workshop, but since we're probably missing a few checker links out there, we'll put it here first.
This is not a discussion of whether checkers should be included on a cache—but feel free to start said discussion in a different thread. This is a collection of various checker services, and comments about them.
What is a checker?
A checker is just that--a way for puzzle solvers to check their solution against the correct solution. They are available at various sites outside geocaching.com. You provide the solution to the site, and the site gives you a link to include in your cache page (more on that later).
Here are the ones we’re aware of so far:
Pros: Most commonly used; easy to use; supports proximity solutions (also known as "horsehoes and hand grenades--where the solution can be within about 100 feet of where the cache is.); validation code now easy to read
Cons: Seems to have more frequent outage problems than other services.
Pros: Easy to use; supports proximity solutions.
Cons: accepts only one wrong solution before a timeout (perhaps a “pro” for puzzle creators—but a “con” if you mis-type)
Also: Apparently now displays number of correct and incorrect solutions tried (?)
To use the checker link, simply paste it into the body of your cache page, somewhere. Just be sure to also have the "this page contains HTML" box checked when you create or edit your cache page on geocaching.com.
Dressing up the link
It's easy to change the plain link you get from the checker site. Most links look something like this:
You can check your answers for this puzzle at
<a href="http://www.geochecker.com/some.big.indeciperable.string.of.stuff.here"> Geocaching.com</a></p>
In that link, the boldfaced text is the stuff you can change to your own text. Do NOT change the http:// link!!! The text that comes after the end of the string and before the </a> is where the actual link is.
You can put text in here, or you can also use an image. Here's how you would make an image on your page a clickable checker link if that image is in the gallery of your cache page:
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