Get Navi chips
Defeat Woodman, Sharkman, Skullman, Protoman, Fireman, Elecman, Numberman, Gutsman, Iceman and Colorman over busting level 5 to receive their own battle chip with one of their most powerful attacks.
You can actually get Navi chips in the trading machines in Higsby's shop. For example, you can receive a Roll3, Woodman1, Protoman2, Pharoahman1 or Sharkman2 chip just by putting in chips. However it seems that it will only give these chips if you have them already.
After you defeat a Navi and get their chip once, fight it again later. If you defeat it without taking any damage, you should get either an extra of their chip or a stronger version of their chip.
If you want to get Navi or any other chips, go to Higsby's Shop. Go to the Blue Trader and save. Then, put in 10. If you get the one you want, leave, save, and try for another one. If not, reset the game and try again.
Anubis chip
You do not need to complete the game to get the Anubis battle chip. You can also get it in the chip trader.
Popup chip
In a few areas on the net you will find the Popup enemies, who resemble some sort of dog. They only have 10 HP, but every time you hit one, it will drop into its hole and pop out of another one. The more HP taken away, the faster it will go back into its hole. It is virtually impossible to defeat by the time it has at most 3 HP remaining, because when it goes into its hole, it will escape. An easy way to defeat it is to use the Anubis chip. You have to have completed the game at least once so you can get the Anubis chip from Pharoman. When you fight the Popup and have an Anubis chip to use, just set it down. The Anubis continuously depletes the enemy's HP (even multiple at a time). The Popup will automatically get hurt when it comes out of the hole. After it is defeated, you should get the rare Popup chip, which makes you invincible for a turn when not attacking (same as the Dropdown).
Adding chips to your folder
Press [A] on any chip on your sack, then press [Left] and exchange the chip.
Power Plant
Once the subway starts working and you go into the second town, on the first block go up and turn left (do not cross any sections). There are various sections to stop (save after every battle). To get into the power plant finish the cross section and go to the park in your town. You will meet your dad who invites you to a party with mom. Once you are there, the power goes out. You will exit the dining room and go down the laundry chute.
School network passwords
Door 1: 09
Door 2: 30
Door 3: Random
Door 4: Random
Door 5: 15
Door 6: Random
Door 7: Random, but also requires Teacher's password.
Advances
Advances are when you pick a particular combo of chips. You can learn two of them by talking to the kid besides the Numberman sign in Higsby's Chip Shop and the little girl in Block 3 of Dentown, in front of the Print Shop. Advances can be three of the same chip in alphabetical order. This usually gives a "z ?????" which lets you use your chip as many times as possible in five seconds and activates an Invisi1 type move.
Program Advance
This program mixes different chips and makes a stronger one. Note: It will not harm the game.
Zeta-Cannon 1: Cannon ABC or Cannon BCD
Z-Cannon 2: Hi Cannon GHJ or Hi Cannon HIJ
Z-Cannon 3: M-Cannon KLM or M-cannon LMN
Z-Arrow: Tri-Arrow CDE
O-Cannon 1-Cannon ABCDE
O-Cannon 2-Hi-Cannon HIJKL
O-Cannon 3-M-Cannon KLMNO
Lifesword1: Sword A, Widesword A, Longsword A (in that order)
Bug Style bugs
Navi Master
Finding the Navi Master takes quite some time. Below is the list of clues and where they lead you. Note: They may not be in order. The first clue leads you to the board outside the Marine Harbor Station (the restaurant board).
"The jug past the four cedars" leads you to Okuden Dam. Talk to the Official on the dead end.
"Big Bird Brain" leads you to the cockpit of the plane. Check the monitor near the door.
"Place that overlooks many cultures" leads you to the top of Netopia castle (where Knightman was located). Again, talk to the official.
"Coffin of things cast away by humans" leads you to one of the dumpsters in the alley in Netopia.
"Cyber forest, object of treasury" leads you to where Chnge. Bat was located. Talk to the Navi.
"A thing that plays a tune" leads you to Mayl's piano. Jack in and talk to the purple Navi in one of the corners.
"My natural parents" leads you to Lan's dad. Talk to him and the battle begins.
You will have to battle the V2 of the Navis you battle by talking to their operators. They are as follows, again not in order: Gutsman, Gateman, Snakeman, Toadman, Thunderman, and Protoman.
Muramasa
Put at least three Navi chips, five Cannons, and twelve of your choice and you should get that chip.
Defeating Bowl Man V4
Use Ice stage to freeze the ground in order to increase electrical attacks. Then, use Sensor 3 in the middle line which should hit Bowl Man several times before it fades. Then, use Plant Man V3 or V4. He should be dead or almost dead at least.
Defeating Shark Man
When fighting Shark Man, he will hide under the tiles on his side. His shark fins will be moving up and down their columns. To find him, use an attack that damages the entire enemy area, such as Ice Man. The attack will hit all of the fins and do damage to whichever one is Shark Man.
Encountering Bass
To encounter Bass from the classic Mega Man games, get 174 battle chips in your library. This is all the chips except for the one he drops, which is the Life Aura. Then, go to Internet area 16 where the two men are standing almost parallel. Walk around (it may take a while) and sooner or later you will encounter Bass. Put all the Recover 300 chips you have in his folder, as he is very difficult.
Easy S busting level
Use a Navi chip. When you use it, the background goes black and time freezes. When your enemy is destroyed, it should say S Busting Level, and your time will be in the milliseconds.
Easy money
After completing the game, go out the school gates and go to the right (not Lan's right). There will be a man at the end of the wall who says that he lost his money. Go to the place where you fought Stoneman in the net, and there will be a purple man. Talk to him to fight him. After defeating him, go back to the man at the wall. He will give you 10,000 Zennies.
Secret area in Sal's P.C.
Take the normal path until you reach a two way path. Take a left turn and follow the path until you reach another two way path. Take a right turn until you reach a two way path. Go down until you see a dark gray spot. Walk on it and take a right to enter the secret area.