Castle Library is a competitive multiplayer Quake level for two to four players. The map occurs on a forgotten castle floor once used as a library. If you want to learn more, check out my GitHub.
When building this level, I often had to revise the grey box. I had built the circular room of the map first, this helped me keep it as the center focus as well as when building the rest of the level it made it easier to keep it more symmetrical. In my revisions, I also decreased the size of all the rooms, which helped make the map easier to maneuver around and improved the chances of players running across each other during the death match, even when playing in small groups. I added support pillars around the map and bookshelves for the player to use as covers during the game.