Missable content

This section is under construction.

The information may not be complete or 100% accurate.

This page lists items and content in the series which can be permanently missed, or becomes substantially more difficult to obtain, if not obtained by a certain point in the game.

Note: due to the Chip Trader's low odds of getting the chip you need, chips which can otherwise only be obtained through the Chip Trader are also treated as missable on this page.

Mega Man Battle Network 1

This section is under construction.

The information may not be complete or 100% accurate.

List Mystery Data in dungeons which disappear after finishing the dungeon (e.g. Oven Comp)

Missable Item	Location	Alternative ways to get
Recov10 A	(Chapter 1) Inspect the dinner table in Lan's House before leaving for school.	Starting Folder (3 copies), Chip Trader
10,000z	(Chapter 6) At the start of chapter, talk to Yai to receive a reward for the gift.	---

Mega Man Battle Network 2

Chapter #	Missable Item	Location	Alternative ways to get
Chapter 1	"More viruses!" E-mail	Talk to the girl in the classroom	---
Chapter 2	Bubbler G	While helping for the barbecue, talk to the scientist in Camp at Okuden Valley.
Chapter 3	Recov50 *	After getting the A License, talk to the Official at the counter of the License Office at Marine Harbor.
Chapter 4	FireBlade R	When the goons infiltrates The Square, talk to the older Official in front of the elevator at the Lobby of Marine Harbor.
Chapter 5	SilvFist I	When Lan has to go get a Passport, go read the note on Dad's PC.
	Stolen Money	Talk to the blonde man in Netopia Airport. Delete his viruses to get your money back. Normal Mode: Fishy3, Fishy, Flamey Hard Mode: MegalianW, MegalianH, Snapper
	Quake2 W, TreeBom1 *, and Sonicwav I	After making up with MegaMan, talk to Mr. Higsby, he will give these chips.
	30 Guard *	When it's time to pay Jim for his info; After defeating the Navis in Netopia 3, talk to the drunk man in the alleyway. Then talk to the Electopian girl in front of Netopia Castle.
Chapter 6	Repair L	Talk to the blonde man in the Economy section of the plane.
	Souvenirs	Before heading to the airport, talk to the sunglasses man in Netopia Town to buy Broach, RoboX, and GoldRing. 10,000z, GutPunch D, and Recov150 P: When Lan returns to ACDC Town, give these souvenirs to Yai, Dex, and Mayl for each reward.
	20 Guard *	Before heading to bed, talk to the boy running behind the house behind Lan's house in ACDC Town.

Mega Man Battle Network 3

Missable Item	Location	Alternative ways to get
300,000z	When doing the Legendary Tomes quest from the Job BBS, after obtaining all 3 Tomes, go to the Teachers' Lounge and inspect the statue to obtain 300,000z. This must be done before the Tomes are turned in.	---

Mega Man Battle Network 4

Green Mystery Data

The contents of green Mystery Data vary for each difficulty. In some cases, depending on the difficulty and version of the game, green Mystery Data is the only (infinite) source of a chip code (aside from the Chip Trader).

For the chips listed below, once the player has moved on to the next difficulty, they can no longer obtain (infinite) copies of that chip, other than:

• Chip Trader
• Shop with limited stock
• Chip Order using an infinite source of another code
• Version-specific virus drop

Bolded chips means the chip does not not have a * code which could be obtained instead.

Difficulty	Affected version	Missable chip code	GMD location	Alternative ways to get
Game 1	-	HiCannon C	Sharo Area	Higsby's Shop (max 3), Chip Trader
	-	Vulcan2 H	Undernet 2	Netopia Area Shop (max 3), Chip Order (limited), Chip Trader
	Blue Moon	Thunder1 L	ACDC Area 2	Billy LV.5~10 (Red Sun), BillyEX LV.7~10 (Red Sun), Chip Trader; can obtain Thunder1 * from BillyEX LV.9~S (both versions)
	-	FlmLine1 *	YumLand Area	Chip Trader (extremely rare)
	-	EnergBom N	Town Area 2	Chip Order (limited), Chip Trader
	-	EnergBom T	Netopia Area	Chip Trader
	-	LongSwrd E	Town Area 2	Chip Trader
	-	LongSwrd L	Undernet 1	Chip Trader
	-	CustSwrd S	Undernet 1	Town Area 2 BMD (G3), Chip Trader
	-	Counter1 F	Town Area 3	Chip Trader
	-	Counter1 T	ACDC Area 3, Park Area 2	Game Comp BMD (G1), Chip Trader
	-	Counter2 L	Undernet 6	Meteor Comp 3 (G1), Chip Trader
	Blue Moon	MokoRus1 M	Town Area 3	Moloko LV.9~S (Red Sun), Chip Trader
	-	CrakOut *	ACDC Area 1, Town Area 1, Undernet 4	Starting Folder (3 copies), Chip Order (max 1), Chip Trader
	-	Recov10 *	ACDC Area 1, Park Area 1	Chip Trader (extremely rare)
	-	Recov30 R	ACDC Area 3	Town Area 3 BMD (G1), Chip Trader
	-	Recov80 B	NetFrica Area	Town Area 3 Shop (max 3), Chip Order (limited), Chip Trader
	-	Geddon1 J	Undernet 4	Chip Trader
	-	Geddon1 K	Netopia Area	Chip Trader
	-	Barrier *	Park Area 3	Chip Trader (extremely rare)
	-	Barr100 W	Undernet 6	NetFrica Area BMD (1st time), Chip Trader
Game 1 & 2	-	Recov50 *	YumLand Area (G1), ACDC Area 1 (G2), ACDC Area 3 (G2), Park Area 1 (G2)	Chip Trader (extremely rare)
	-	Recov80 *	Undernet 1 (Game 1), YumLand Area (G2)	Chip Trader (extremely rare)
Game 2	-	HiCannon E	ACDC Area 1	Town Area 3 BMD (G2), Chip Trader
	-	M-Cannon G	Sharo Area	Undernet 4 BMD (G1), Toy Robot Comp 1 BMD (G3), Chip Trader
	Red Sun	Thunder2 S	YumLand Area	Silly LV.7~10 (Blue Moon), SillyEX LV.7~10 (Blue Moon), Chip Trader
	Red Sun	HeatBrth D	Sharo Area	Whomper LV.5~7 (Blue Moon), Wither LV.9~S (Blue Moon), Chip Trader; can obtain HeatBrth * from WeatherEX LV.9~S (both versions)
	-	EnergBom E	ACDC Area 1	Chip Trader
	-	WideBlde S	Undernet 1	Chip Trader
	-	CustSwrd P	Town Area 4	Chip Trader
	-	Counter2 B	Park Area 2	Chip Trader
	-	Counter2 H	ACDC Area 3, Town Area	Chip Order (limited), Chip Trader
	Red Sun	SidBmbo2 O	Undernet 6	Kilbur LV.9~S (Blue Moon), Chip Trader
	Red Sun	MokoRus2 U	Town Area 3	Milko LV.9~S (Blue Moon), Chip Trader
	Red Sun	BigHamr2 G	Undernet 2	Gaia+ LV.9~S (Blue Moon), Chip Trader
	-	Fanfare *	Undernet 4	Chip Trader (extremely rare)
	-	Discord *	Undernet 4	Chip Trader (extremely rare)
	-	Timpani *	Undernet 4	Chip Trader (extremely rare)
	-	Silence *	Undernet 4	Chip Trader (extremely rare)
	-	Guard2 *	Town Area 1, NetFrica Area	Mettaur2EX LV.9~S (G2), Chip Trader (extremely rare)
	-	Geddon2 T	Netopia Area	Chip Trader
	-	Barr100 Q	Park Area 3	Chip Order (limited), Chip Trader

Viruses

For most viruses, lower versions can be encountered even on the highest difficulty (Continue 3+). However, there are a few viruses that only appear on a specific difficulty. As a result, this may lock you out of obtaining certain chip codes, which can otherwise only be obtained (very rarely) from the Chip Trader.

Bolded chips means the chip does not have a * code version which could be obtained instead.

Difficulty	Virus	Missable chip codes	Alternative ways to get
Game 1 only	GaiaEX	-	All codes can be obtained from Gaia and Chip Order
	CirKill	-	All codes can be obtained from CirKillEX
	BomBoy	-	All codes can be obtained from BomBoyEX
	WindBox	-	All codes can be obtained from WindBox2 and WindBox3
	VacuumFan	-	All codes can be obtained from VacuumFan2 and VacuumFan3
Game 2 only	Mettaur2EX	Guard2 *	Chip Trader (extremely rare)
	SillyEX	-	All codes can be obtained from Silly
	Gaia+EX	BigHamr2 W	Chip Trader
	KilburEX	SidBmbo2 H	Chip Trader
	Webby	WhitWeb2 E WhitWeb2 Y	Chip Trader; can obtain WhitWeb2 * from WebbyEX LV.9~S
	CirCrush	-	All codes can be obtained from CirCrushEX
	MilkoEX	-	All codes can be obtained from Milko
	WindBox2	-	All codes can be obtained from WindBox3
	VacuumFan2	-	All codes can be obtained from VacuumFan3

WaterGod Comp Gold Mr. Prog

Main page: WaterGod Comps

The WaterGod Comp can only be accessed if Lan fights Paulie as an opponent in the Red Sun / Blue Moon Tournament. In the WaterGod Comp, a gold Mr. Prog known as the WaterGod Program has a low chance to spawn upon jacking in to the comp. It will give up to 5 rewards from a pool of 8, depending on the current difficulty. As such, certain BattleChip rewards for Game 1 and 2 can be missed.

Whether Paulie will appear in the Red Sun / Blue Moon Tournament, and which rewards will be given by the WaterGod Program, are both determined at the start of the game. Therefore, the player has no control over this and getting the chips below is simply up to luck. Additionally, Paulie cannot appear in both Game 1 and 2.

Difficulty	Missable chip	Alternative ways to get
Game 1 only	WideBlde C	Elec Tower Comp 2 BMD (G2), Chip Trader
	Lance A	Chip Trader
Game 2 only	Geddon2 Y	Chip Trader
	Barr200 I	Chip Trader
	MegEnBom W	Chip Trader
	VarSwrd J	Chip Trader