by Spuzzum
Provides a "memory" interface that makes players memorize information about the map, and only notice changes when returning. Also blacks out all unexplored portions of the map.
Should work straight out of the box. However, since it overrides mob/player/Login(), there will likely be some configuration necessary.

Since this is published as a snippet rather than as a library, there will likely be some assembly (the action, not the language =P) required.