What do you do after you get the grandpa letter and then look at the back..

If I'm not wrong, you must go to oran isle, go to the air cleaning unit and jack in, talk to the mr.prog. He will say that he remembers a dog burying something in the far corner, go to the upper right corner,examine.Then go to End City, Go into the castle, go to the top of that castle, you will see 2 big yellow fishes,go to the right side of that fish, talk to the eye of this fish, then you will read another clue, then jack in to ACDC Area 3, walk to the place with a 9 square, you will see a navi standing there at the left corner of this place,talk to him, he will ask you looking for something, then you must press "Yes", then he will give you a key, don't leave that place, move right, go to the centre, then press 'A' button, and there will appear a door, after that complete the story, go to SciLab 3, use OldPCode to unlock the cube, then continue going, then you will see an old navi standing at ACDC Area 2,talk to him, he will give you a SciKey, then go to SciLab 3, go to the death road which is 3X5 area, walk to the centre, press 'A' button, you will see another door appear, then go to Oran Isle , jack to Drill Comp 4, go to the machine which use StopKey to stop the rock continue falling, you will see a green navi talk to it, it will ask you something, then go near that machine, turn right and press 'A' button, then you will see a door appear. Hope I help you on this clue.