Alright, so for the MvM contest I thought of a simple but unique gimmick and I'm not sure there's a way to make it work. Essentially I'd like to add more threat to the tank and add some degrees of success to the mission by doing the following: When the tank goes past a certain point in his track he destroys a wall, opening up a shortcut for the bots and subsequently making it harder for you to win the waves. Now... firstly I'm not sure what the best way is to make a blocking wall that's removable that at first blocks nav and then later doesn't anymore. Probably easy but I've never had to do it and I'm not sure the TF2 nav mesh can do it. Secondly I don't see a way for the walls to reset when a wave is reset. The MvM entity doesn't have an "OnWaveReset" output or anything, am I missing something there? Is there some workaround?