Secret VarSword codes:
Once you get the VarSword chip you can use "secret swords attacks" in every battle you want . When you are in a battle select the VarSword chip , press and hold A and enter this codes quick.

Down,Down-Right and Right - Long Sword attack
Up,Up-Right,Right,Right-Down and Down - Wide Sword attack
Down,Left,Up,Right and Down - Life Sword Attack
Left,Left-Down,Down,Down-Right and Right - Hero Sword Attack
Left,B,Right and B - Sonic Slash Attack

NeoVari Attacks:
After you get the chip NeoVari N from Undernet5, you can push the A button for a slash that does 240 DMG. But, if you put in certain combonations while you hold the A button down, you can increase the range of the sword.

Up, B, Down, B, Up - Double LifeSword
Down, Right, Up - Cross Sword
Left, Right, Left, B - Super Sonic Boom

Code to get in to Park Area:
Once you beat the normal Navi decode this AJEKDUR2437561 and put it into the Staff Code window.

RAEJDUK - Get into Park area 1

NumberMan Trader Codes:
When Higsby gets the NumberMan Trader, enter these codes to get the items.

88019791 - TwinFang 3 G
57604335 - FlameLine 3 J
46292983 - FlameLine 1 G
68009092 - WideShot 3 T
74293099 - GunDelSol EX G
77038416 - AirHockey 3 V
66703422 - Recover300 J
32108251 - Snake R
03696458 - VariableSword C
19095677 - ColorPoint *
30873642 - HP+500(NC Block)
02109544 - MegaFolder2(NC Block)
73298100 - Rush(NC Block)
25435428 - Beat(NC Block)
10170506 - Tango(NC Block)
43494372 - Body Pack(NC Block)
05178924 - Buster Pack(NC Block)
75420107 - Custom2(NC Block)
97618739 - HP+500(NC Block)
14769745 - Untrap
02368995 - Untrap
24247309 - SneakRun
89866302 - SneakRun
27979609 - LockEnemy
37198940 - LockEnemy
16589650 - MiniEnergy
45798331 - MiniEnergy
59891137 - FullEnergy
84625799 - FullEnergy
00274304 - Unlocker
94872322 - Unlocker

Obtaining Giga-Level Battle Chips:
To obtain the rare giga-level battle chips, you will have to complete some of the game's most arduous tasks. It is expected that you have an almost full-library and high stats before attempting to obtain most of these.

Bug Charge - Defeat either ShademanSP or LasermanSP without destroying the Green Mystery Data to obtain this giga-level chip.

Darkness Aura - S-Rank ForteSP, a random encounter in Black Earth 2 to obtain this chip.

Forte - Defeat Forte behind the Standard Gate in the Ura-Internet to obtain this chip.

Holy Dream - Bought from a Shop in Ura-Internet 4 for a whopping 100 BugFrags

Red Sun Ray - Talk to Yuuichiro at ANSA before the end of the game and he will give you this chip

Hard Mode/Super Hard Mode:
Hard Mode - Choose second choice after beating game.
Super Hard Mode - Choose the second choice after beating Hard Mode.

First (or All) Seven Save Icons:
The Save Icons are as follows:

Meteo Red Sun Icon - Beat Duo in Normal Mode
SoulComplete - Get All 6 Souls
StandComplete - Get All 150 Standard Chips
MegaComplete - Get All 60 Mega Chips
GigaComplete - Get All 5 Giga Chips
PA - Complete Use All 30 Program Advances
Forte's Icon - Beat ForteSP in Black Earth 2

Secret Boss:
To get past the gate in Ura Internet area 5, you need all 150 regular chips. Once you get past it, you can fight the secret boss, Forte, and get his chip, Forte.

Secret Dungeon:
There is a large hole surrounded by purple slime on a platform in Ura Internet area 6. In order to approach it, you need the chips ''Bug Charge'', ''Muramasa Blade'', ''Black Wing'', ''Element Dark'' and ''Poison Anubis''. Once you get close enough, it will suck you down to the secret dungeon, Black Earth.

Secret Boss 2:
After completing the Black Earth dungeon, exit (plug out) and re-enter. You can now encounter Forte SP in Black Earth area 2, and obtain Black Barrier from him. Secret Boss: Duo SP One more thing to add: To fight Duo SP, you need to have all the 7 symbols

1 for Duo
1 for Soul Complete
1 for Standard library complete
1 for Mega Library Complete
1 for Giga Library Complete
1 for P.A. Complete
1 for Forte SP

Go back to where Duo was and fight him there!

Easily defeat Dark users in Multiplayer:
In multiplayer, Dark users are very tough because they become the Darksoul when you reduce them to 0 hp. However, if you use a chip or PA that freezes time and deals many hits, you can kill them without allowing them to become the Darksoul. A great example is the Pile Driver PA. Hope this helps you take out those cheap Darkies!

Avoid Random Battles (JP Version Only):
To avoid random battles, save your game about every 20 steps. This will reset the game's random seed, which also resets when your next random encounter will be. Now you can go through the entire 'Net without running into a single fight, or resetting your system because you got into a fight!