Edit: What would be a great way to start my first post? Why, making a typo in a major TF2 game mode in the title of course! While working on my first map in hammer (to get my hands dirty on the tools before making a real planned out map) I played around with changing the mechanics a bit for Mann vs Machine without alienating players. The idea that so far held up (and worked overall fairly well) is a door that opens only between waves. This way there would be a distinct difference between 'robot walkways' and 'safe ground' compared to vanilla maps which mostly have small platforms with one or two ways to get on them. With robot flanking routes taking a reasonable amount of time while moving around between waves not being too annoying and slow, the doors being closed at the first wave to get the player used to this concept and the occasional mob of working class scouts beating the bourgeoisie Engie into submission followed by a sentry buster taking out the sentry nest still being a common sight, it seemed a reasonable idea to keep in the map. Below are screenshots of the door in the map currently and the difference between open and closed. Not shown is a tunnel that gives access to the top floor for robots and unlucky heavies swarmed by more robots. Has anyone before played around with this idea, and how did it work out in playtesting? Is it too different from regular MvM to be a useful feature of a map? I would love to hear opinions on this idea while I continue work on the next section of this map.