This is a dynamic Javascript maze with changing passageways. The graphical effects for this maze use a feature called hidden overflow, which was introduced to the web in 1998. If your browser is 13 years old or 13 years out of date, the original version will appear a huge mess, and you won't be able to read the instructions. If that happens, pick Back and use the frames version instead:
Note: Almost every modern browser in existence supports hidden overflow. The only ones that don't are some versions of Internet Explorer.