This is my first map created in Half-Life. It is a small map, it should not take more than 5 minutes to complete. Any advice, tip, criticism is more than welcomed, as I want to improve. This is just one map. Put the map (canal_falling_0) into your maps folder. Open the console in the game and type map canal_falling_0 to load it.
You fall into a canal. Make your way out while trying to survive against zombies and headcrabs.