Portal Stories: Mel is a total conversion mod for Portal 2. Consisting of 22 levels with new environments, tough puzzles and a strong story. Complete with over 350 voice-lines, a full soundtrack, custom models, textures, particles and much more! The average playtime is 6-10 hours, depending on experience with Portal 2. All the puzzles in the mod can be solved with clever thinking, quick reactions are never needed.
A screenshot of one of the maps in Portal Stories: Mel.
An even more challenging version of this map is now available on the workshop: Steamcommunity.com