Deepen Excursion (Anagram for Sound Experience) is an abstract modding project inspired by Radiohead's KID A MNESIA Exhibition. At its core, it is a mod for Portal that involves lots of mini sound and art installations: some are short puzzles, some are platformers, and some are just areas where you walk around and look at cool things. However, one thing remains in common... everything is built around music. In fact, the music is just as important as the mod itself.