The game needs the expansion pack to work, don't forget to activate it!

In Project64, click on "Options" then on "Settings" in the "Options" tab you must uncheck the "Hide advanced settings" box. Then you have to go back to the settings, there will be many more tabs, click on "ROM settings", and set the RDRAM size to 8MB.

Filename	Size	Note
Mario in the Dreamscape (v1.1)	12.45MB	Hack