Ladders

First create a new object ladder.  It has no events/actions.

Go into your character object.

In the Step event you already have and start by adding the following actions at the end:

• Comment: "check if on ladder"
• Check Object: object 'ladder', (0,0), rel.
• Add start & end blocks

Inside the Start & End blocks add:

• Set Gravity: direction 270, gravity 0
• Set Variable: variable "vspeed", 0
• Change Sprite: sprite = characterClimbing

You should now have all these actions at the end...

Go into the <Up> event. When the character is at a ladder, the up arrow key should move it up, rather than jump...

Before all actions, add:

• Check Object: object ladder, (0,0), relative
• also add Start & End blocks
• Add Else and start & end blocks around what you already have

Then inside Start & End blocks at the top (if on ladder):

• • Check Empty: is there anything just above?
    (0,-3), only solid, rel.
  • Jump to Position: If there isn't, move it up a bit
    (0,-3), rel.

So your <Up> event should now look like this...

We'll do similar actions in the <Down> event...

• Check Object: object 'ladder', (0,0), rel.

Go into Check Empty and Jump to Position actions and change the Y values from "-3" to "3". Checking if anything just below? If there isn't, move it down a bit.

Add the ladder object and a platform for the character to step off onto at the same height.

When you test it out, your character should change as soon as it touches the ladder; the Up/Down arrows should make it climb up and down, and you should be able to step off onto the top platform.