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Simply click on the barrier cube and then walk to the scientist in sharo labs. he'll let you through.
You get to Netfrica and go west. Then you should be in Sharo. Use your C-Slider to slide though the line and you should be in the Undernet.
You can find it where the navi who gives you c slider. Which you need an unclocker for ( The navi is in Sharo area where all the arrows are)
You can find a "Black Bomb Z" in "Sharo Area" in the Space Center computer. When you're in Sharo Area, look for an orange girl, Navi, she'll be near a purple locked data. Use an unlocker, and then you'll have your Black Bomb Z.
no you cant
Blue moon or red sun?
lazrman is blocking the entrance to the red sun/ blue moon meteor server
You need to get/have the C-Slider. Once you get that, you need to get to Netfrica Area and go in directions that lead you west. Once you get to the TOP west, there should be a blue entrance arrow. Go in there and you should be in Sharo Area. Go through all the moving sidewalk arrows and there should be another entrance. Once you get there, you should be in the UNDERNET.
no
The red key in Megaman Blue Moon can be found in the square with the four horns around it. You have to go to the left side of the map and go up the path to the warp to Undernet.
http://tartarus.rpgclassics.com/mmbn4/walkthrough23a.shtml
some where in castillo area from the net