Just like the original "Blue Zone B-6" by me, this map never saw an official standalone release due to Cncmaps' unexpected shutdown in 2014.
Blue Zone B-6 [No Walls] is a revamped variant of the original "Blue Zone B-6" by me. After finishing the original Blue Zone B-6 back in 2014, and having played the map many times, I soon realized that there was a problem that I hadn't taken into account fully when designing the original map at the time: The walls surrounding the city were limiting players' access to the city, and the entrances could eventually become chokepoints.
I didn't like that, so in 2015 I began working on an alternative and improved version of the map in hopes of removing the issue and making the city more accessible. In order to do that, I removed the walls surrounding the city, added an extra Blue Tiberium field in the city, 2 Tiberium Silos (worth $5000 when captured + building space) and some extra Tiberium Spikes. I also reworked the ingame minimap for this particular release, so it is a pretty close depiction of the actual battlefield despite being "stiched together".
Original Blue Zone B-6 can be found from here [Workshop page]: https://steamcommunity.com/sharedfiles/filedetails/?id=3435614850