To start with I will need one to RS gold return in the dungeon and block the entrance. Here, take these boards. The proffesor provides you 5 planks and at this point you need to receive 10 bronze nails and a hammer to keep the boards in place. Go to the dungeon nearby and if you get to the staircase you grew in Observatory Quest use the planks into the top stair. You do not need to kill them if you want to they each have 45 hp and only drop bones.

When you return talk to the proffesor. He will thank you and tell you that there's one more thing that needs done. I need you to earn an iron stairs from just outside of here to the observatory. Luckily, my calculations show you only require 27 iron bars value of metal to reach the top! At this point you need to go bank any things in your stock aside from a hammer and of course 28 iron bars. When you get back speak to the proffesor's helper.

Where should I put up the stairs? There ought to be a wooden platform just outside you can set it on. Then go outdoors as the assistant stated, there is a'wooden stage' a few squares away. Utilize an iron bar to the platform and a small cutscene will unfold of you slowly earning a staircase to the top of the mountain in cheap OSRS gold which the Observatory is. After the cutscene ends, you'll see yourseld from the Observatory. Go back down to the visitor's centre to complete up the pursuit.