From New Zealand Connections

The random page feature allows users to view a wiki page at random. The default, and most convenient use is to show a random page in the main namespace, and is accessed through the Special:Random page. Users will be redirected to the selection.

Special:Randompage is an alias for the feature and works in the same manner.

Namespace selection

Users can also opt to view a random page in a namespace of their choice. This is achieved by specifying a namespace as a parameter to the page, i.e. Special:Random/Help will select a random page in the Help namespace; Special:Random/Category will show the contents of a random category, etc.