Digital Illusions' upcoming first person action game Mirror's Edge is generated a lot of buzz and much of that was created when journalists got to see a level of the near-future themed game at E3. The demo was filmed and shown on the Internet to show off the title's use of running and jumping to scale the game's buildings.

That trailer was used as the basis for a homebrew created level by the designer known only as "EvilWeevil" as a level for Valve's classic 2007 action-puzzle game Portal. While the level (shown on the 1Up.com site as a video) is not exactly complete it does show that even trailers of games can inspire third party level designers to re-create what they have seen in other games.