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It depends upon the arrangement of the valves, and what the final difference in pressure needs to be. You still need the key for each door.
For Sully's door, the output has to be 5, for the bridge 16, and for the Living Quarters 7. That means that the "total change" for all of the connectors has to modify the input (10) by that amount.
Sully's door -- total change on the bottom meter is -5
Bridge control -- total change on the bottom meter is +6
Living Quarters -- total change on the bottom meter is -3
You need to include more negative (-) than positive valves for Sully and the Living Quarters, and almost no negatives on the bridge.
What else can I help you with?
How do you defeat Steamworks Island?
(The solution is at the related question "How do you beat Steamworks Island")
How do you beat steamworks island on video?
There is a video walkthrough at the related link below. There are written WikiAnswers solutions at the related questions, as there are for all Poptropica islands. (How do you beat Steamworks Island) (What is the walkthrough for Steamworks Island)
How do you get the medal for steamworks on poptropica?
Beat the island.
How do you beat the Bridge terminal in steamworks Poptropica?
how to do the bridge terminal on poptropica's steamworks island
Which is easier reality TV island or steam-works island?
reality tv island already beat it steam works is hard and long
How do you beat steam works Island Plant Hive?
jerkin' it.
What do you do after you have beat the plant monster steamworks Poptropica?
This was a glitch in poptropica that they forgot to make a way for you to get out. If you have haunted house island or something like that, just go there and exit to go back to steamworks, where it will take you back to Main St.
How do you beat the vine monster on steamworks island?
When Sprocket is grabbed by the vines at the Captain's Quarters, slam the metal windows shut to cut the vines.
How do you beat the island with the museum on Poptropica?
The island that includes a museum in the quest is Counterfeit island. (see the related link) There are also museums on Early Poptropica, Shark Tooth Island, Nabooti Island, AStro Knights island, Mythology Island, Steamworks island, Cryptids Island, and Game Show island.
How do you beat mechanical island on Poptropica?
There is no Mechanical Island. However, Astro Knights Island is replete with robot plants and animals, while Steamworks island has actual plant monsters as well as mechanical devices. Game Show Island is populated by robots. (see the related questions)
What do you do with the toxic blaster on steamworks poptropica?
You use it to beat the plant boss at the end :)
How do you beat gear works island?
The name "Gear Works" may refer to the Poptropica island called "Steamworks Island." -- Gear Alley is the left side of the island away from Main Street -- Gear Shop is the common room (multiplayer) on Main Street (see the related question below)
