'K, here's how it works.
In the page you want to link to, for example "Party Quirks" on the Improv Games page, you would create an "anchor" like this on the Improv Games page:
[[# party-quirks]] Party Quirks
Bear in mind that there is a space between the pound sign (#) and the name of the anchor.
To link to it from another page you would do:
[[[improv-games#party-quirks |Party Quirks]]]
Here is an example. I have anchored all the games on the improv page thus far created, and I'll change links on the rest of the wiki as I encounter them.