In 2015, way back in school, I started working on a bomb defusal map for Counter-Strike: Global Offensive. I was only able to do the greyboxing due to my lack of 3D software knowledge back at that time.
There was quite a lot of playtesting involved into the making of this map – little I knew, balancing a tiny map was extremely challenging.
The map can be downloaded on the Steam workshop and requires a copy of Counter-Strike: Global Offensive to be purchased. https://steamcommunity.com/sharedfiles/filedetails/?id=526524438