Unlike Never CTF and The Bigs Rooms, Build Your Fortress is vertical and features a compressed level design. There are some neat tricks to this level, like engineering a teleporter to the enemy flag, and hiding the enemy's flag in your spawn area. These gimmicks do take away from the level a bit, and will often deter players from building too much. But that's not an entirely bad thing as this level does indeed emphasize combat over The Bigs Rooms, for instance. The Fort is very similar to Build Your Fortress but features a redesigned base area and fewer resource items. That I think goes in the wrong direction, as I think the resource items and build a base style really make this level.