In one of our previous games, someone pushed our two goals into each corner of the field and then pushed cones in the way of them so we could not access them without spending a lot of time. Is this legal?
While it is always difficult to provide a blanket ruling on a snapshot of a match, there are no rules explicitly prohibiting this type of maneuver. Possible rules to watch for would be <SG6> (if the defensive robot grasped, grappled, or attached to the Mobile Goals) or <SG9> (if the defender used a concave portion of the robot to Possess multiple Cones at once). However, if these (and any other) rules were not violated, then this would be legal.