WikiLadders is a game where you open two random articles and try to get from the first to the second using only the links in the first and subsequent articles. Once you have succeeded, you can go back to try and do it again using fewer links!
Note
editUsing the "edit" tab to insert wikilinks while you are playing the game is only allowed if the links are appropriate (i.e. no linking of common words/common geographical names or any other words you wouldn't normally link to in a Wikipedia article), and they are not to be used while playing (that would be cheating!).
Random articles
editSix Degrees of Wikipedia
editYou can always check your solutions with the online tool Six Degrees of Wikipedia; most puzzles can be solved in fewer than six links.