s.o.s. jumping with the Keybaord (Spoilers)

[RazZziel]

I had no problem piling up some boxes until I can reach an appropiate height climbing them
Once you see the ladder symbol in your mouse, you shouldn't have no problems climbing it. Try to click very fast while jumping and aiming to the ladder, to get the "able to climb lader" event before it vanishes when you fall

(and sorry about my awful english )