Quote Originally Posted by Hidromc View Post
Hello, Im making my own MMO
Usually when people see that they're less inclined to continue reading. Nevertheless I will attempt to help.

Adding ladders to an isometric world should be very similar to ladders in a 2d platformer. I can't get too specific because I don't know your implementation, but generally you'd define an area in which pressing up/down would move the player in the z (up) plane instead of the x/y (ground) plane. In your case you can check on every frame if the player is touching/in collision with a particular side of a wall, in which case he/she in touching the ladder.