Impossible pushing

The rules of the minigame are simple : You play the game, and then you try to describe a level that would be impossible to beat. I then make a level with one extra rule to make that level possible. Basically a reverse UNIQUENESS. Some clarifications : You cant edit previous levels. You need to make sure that the new levels rules wont make the previous levels impossible.I can add new objects, but you cant directly tell me to do it.