This is a a discussion topic for the map "JBR_Cooppuzzle_One_Final" by jrich3600 which can be found here
Map description:
Game is a puzzle map, there are a variety of puzzles to complete to open the final puzzle. Complete all puzzles to clear the map. The map was designed to be challenging, so it is fun and rewarding to complete the levels. Put the BMP file in your HL2DM maps folder. Distribute the map freely please.