There is a large hole in the Ura Internet area 6 that is surrounded by purple slime on a platform and in order to reach the secret dungeon, you need to have these chips:
Bug Curse, Muramasa Blade, Black Wing, Element Dark and Poison Anubis.
Once you have those then when you get close to the hole, it will suck you down into the secret dungeon called Black Earth!!!

A good way to stay alive is to get the navi cutomizer program air shoes and use a chip like geddon 1 or geddon 2 that way you can walk when there are no panels though and even better tip is to get the flot shoes program which means you are uneffected by the panel type so fire does not burn you swamp panels don't drain you you don't slip on ice and cracked panels don't break. Though the only problem is that if an enemy uses geddon two you can't go across no panels.

Usually when you are finding the cyber bats (when you are chasing Roll and ShadeMan) they run around in circles so you should go the opposite way and grab them.Catch those cyber bats.

First of all you need 10,000 Zenny and to be past the part where you fight ShadeMan in the ToyRoboComp and then you must find Django the solar Boy in Undernet 4 he will tell you about ShadeMan and how they fought and he needs the S. Sensor to destroy him.

Then you must go to Undernet 2 Area ( you'll have to go to the entrance of the area) (it's easier to logout and start form the NupopoComp in Netfrica) and find a purple HealNavi he will be complaining about how somebody stole his treasure and it was as shiny as the sun he will say the guy that stole it is in Undernet 6. Then you will have to go to Undernet 6 and look for a black HealNavi he will say that he'll give you the S. Sensor only for 10,000 Zenny buy it.

(be sure to have the 10,000 zenny I told you about earlier) Then you have to go back to Undernet 4 Area and go to Django and give him the S. Sensor (it won't work if Lan isn't in a place with sunlight meaning you have to access the Undernet from the NupopoComp no questions asked).

You will see a short clip of Megaman and Django destroying ShadeMan then when every thing is done you want to look inside the coffin and there will be the Nebula CD now you can unlock those skull gates with the blue mystery data inside. Congratulations I hope you find all the secrets.

To beat Duo, the chips in your folder should run smoothly, not having too many codes, and you chips should be above ground attacks,such as wide shot or life sword. Gun Sol chips are extremely effective against Duo, adn you should have 3 or four Invis* chips. Duo has four main attacks, one is the big fist that covers 4 squares. The others are the Duo Laser, meteor fist and the giant Arm that covers 6 squares. The laser is easy to dodge, all you have to do is go to on of the side rows and dodge the rings by moving foward, then back and foward again. The giant arm covers 2 rows so you would stand in the first row and then move back because he's going to hit again. The meteor fist has no specific place that you can dodge::best way is Invis.

After defeating Bass, enter Black Earth 2 and beat the DS forms of the Navis whom MegaMan can perform Soul Unison with, then defeat MegaMan DS. Jack Out, then return to Black Earth 2 and wander around. Eventually, you'll encounter Bass SP as a random encounter enemy. Beat him with a S-Rank for the Giga Chip [DeltaRay].

When your at castiloco *sorry for spelling im 9* go to the ice cream stand in the square jack in and keep walking around each time your hp life is small it gives you more hp. Often I always are at 1 hp at end of battle then i get a hundred after for rewerd
cool_babydude over and out