 When adding to an escalera, you are allowed to move a Joker from one end of the escalera to the other end.For example, if an escalera is made up of the 8-9-10-Joker, you may add the J to one end and move the Joker to represent a 7 or a Q.When the Joker is in the middle of an escalera (as in 8-Joker-10-J) its position may not be changed, so if 8-Joker-10-J is on the table, you are not allowed to add a 9 to it.