The robot_creek.zip file you have requested: Maps Levels Missions / CE Maps / Q to R Titles / Robot Creek - 5.8mb is not available. Perhaps try browsing all files for the game Halo: Combat Evolved and upload any files you want to share or are missing. This is the only information we could locate:
For more information on Halo, visit Halo2.filefront.com This is a rather unusual mod you don't see everyday. The creator put 2 "towers" of bots in beaver creek that shoot at each other. But thats not the best part, he has also added several sounds to go with different reactions of the bots.