in this rate of time, i haven't hear anything about releases lost in blue 4. There is a new lost in blue: shipwrecked in Wii. So, just pretend if that is Lost in Blue 4. hope I helped:)
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lost in blue 3 is a DS games. lost in blue 1, lost in blue 2 , and 3!
There is not a second one there is only the first one. But in lost in blue 2 there is a second home.
To get the blue door in 4-2 you need to have upgraded the starpedo form so that it can get past the fierce currents. to do this get the blue door on 4-4 and play lvl 4-7, then find the pearl. after that you can use the seal form to get the blue door.
http://tartarus.rpgclassics.com/mmbn4/walkthrough23a.shtml
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