Fight Secret Boss - Bass:
In Den Area 3, above the area with the falling blocks just before FireMan, is a secret platform. You'll need to use a few double jumps to get up here, but you'll eventually find a locked door. In order to open it you'll need to get the Navi chips from all the bosses, including ProtoMan. Once you have them, go inside to fight the secret boss.

Mega Gambling:
Tucked into the upper right corner of the pinball section of Arcade Comp 2 is a hidden Link. Enter here to find a casino where you can play slots at 500 zenny a go to win new chips. In order to get here, jump onto the moving platform and get off of it on the far right side.

PA Combos:
By equipping specific sets of chips at the same time, you can create powerful new weapons. Here's the full list of useful combos.

01. Zeta Cannon: Cannon + HiCannon + M-Cannon = 120 damage + Invis3
02. Zeta Ratton: Ratton1 + Ratton2 + Ratton3 = 90 damage + Invis3
03. Giga Burst: Spreader + Bubbler + HeatShot = 300 damage
04. Stream Arrow: DoubNdl + TripNdl + QuadNdl = 100 damage
05. Greatest Bomb: LilBomb + CrosBomb + BigBomb = 200 damage
06. Dream Sword 1: Sword + WideSwrd + LongSwrd = 200 damage
07. Dream Sword 2: FireSwrd + AquaSwrd + ElecSwrd = 300 damage
08. Dream Sword 3: FireBlde + AquaBlde + ElecBlde = 400 damage
09. Machine Punch: GutPunch + ColdPnch + DashAtk = 100 damage
10. Star Shower: SoniSlsh + GravHold + StarArro = 80 damage
11. Big Heart: Repair + Recov300 + Roll = 200 damage + Full recovery
12. Guts Shoot: MetGuard + DashAtk + GutsMan = 300 damage
13. Double Hero: CustSwrd + VarSwrd + ProtoMan = 70 damage
14. Zero Counter: HiGuard + ZetSaber + Zero = 300 damage

Pick Your Own Chips:
In order to select which set of five chips you bring into a battle, simply exhaust the 15 chips in your folder that you don't want to use. Lan won't give you an empty chip, so he'll be forced to give you what you want. This is spectacularly useful in boss battles, and when trying to create a certain P.A. Weapon