Resident Evil 0 Walkthrough: Complete Guide to the Train, Training Facility, and Final Boss

Resident Evil 0 is the odd one out in the classic series, and that's exactly why a reliable Resident Evil 0 walkthrough is worth more here than in any other entry. The 2002 GameCube prequel — remastered in 2016 and still easy to find on modern platforms — removes the item boxes you leaned on in every other Resident Evil game and hands you two playable characters instead of one. Whether you're playing the original disc or the HD version, this Resident Evil 0 walkthrough covers the train, the training facility, the labs, every boss, and the unlockables waiting on the other side.

Why Resident Evil 0 Plays by Its Own Rules

Set in July 1998, just before the mansion incident, the game follows S.T.A.R.S. Bravo Team medic Rebecca Chambers and escaped convict Billy Coen through a night that only gets worse. It's the last of the classic fixed-camera Resident Evil titles to be built from scratch, and its systems are genuinely different from the rest of the series.

Here's what changes the moment you start playing:

• No item boxes. Every item stays in your inventory or gets dropped on the floor of whatever room you're standing in. Your storage is the world itself.
• Two characters, one screen. Rebecca and Billy travel together, and you swap control instantly using the Partner Zapping System.
• Limited saves. Typewriters still require ink ribbons, so a careless death can cost you a real chunk of progress.
• Asymmetric skills. Rebecca mixes herbs and runs the chemistry equipment; Billy moves heavy furniture and absorbs more punishment.
• Unlockable side content. Finishing the game opens the Leech Hunter minigame, extra costumes, and — in the HD remaster — Wesker Mode.

That first bullet is the one that ruins runs. Players who treat RE0 like its predecessor end up abandoning the shotgun in a hallway they can never find again.

The Critical Path: A Resident Evil 0 Walkthrough, Area by Area

The game breaks into four broad locations, and each one has a distinct rhythm. If you know what's coming, you can plan your item drops instead of improvising them.

The train section is the tutorial in disguise. It teaches you that dropped items persist, that your partner can be parked in a safe room, and that leeches punish slow movement. By the time you reach the training center, a Resident Evil 0 walkthrough is mostly about logistics rather than combat.

A useful rule for the whole game: whenever you enter a new save room, empty your pockets onto the floor except for one weapon, ammo, a healing item, and whatever key item you're actively chasing. You'll thank yourself later.

Partner Zapping: Rebecca vs. Billy

The Partner Zapping System is the heart of the game. You control both characters, swap between them with a button press, and split the work according to who's actually capable of doing it. Rebecca can't shove a bookcase, and Billy can't run the chemical mixer.

Community reports consistently agree on the same mistake: leaving your partner on "Follow" in a room full of enemies. Set them to hold position before you open a door you can't see through, and let them act as a stationary turret instead of a liability. Also, you can hand items directly between the two when they're standing next to each other — use that instead of making two trips.

Inventory Discipline: The Real Boss of Resident Evil 0

A Resident Evil 0 walkthrough that only lists enemy locations is useless, because most deaths in this game come from bad inventory decisions made twenty minutes earlier.

• Pick a hub room. Choose a save room you pass through constantly and treat it as your storage locker. Consistency beats cleverness.
• Craft Molotov Cocktails. An empty bottle plus lighter fluid makes a firebomb that tears through leech clusters. Stockpile them.
• Stop hoarding handgun ammo for bosses. Handgun rounds are for Plague Crawlers and small leeches. Bosses get the Magnum.
• Watch the Hookshot. It occupies a slot for a long stretch of the mid-game. Drop it the instant its current job is done — but note where you left it, because you'll probably need it again.
• Keep healing on the fragile character. Rebecca dies faster than Billy, so the First Aid Spray should usually live in her inventory.

If you're playing the remaster, you also get modern control options alongside the classic tank controls. Modern controls make dodging Eliminators noticeably easier, though fixed camera angles can still blindside you during a chase.

Weapons, Ammo, and What to Actually Carry

Not every weapon deserves a slot. Here's how the arsenal shakes out in practice.

Ammo conservation is the difference between an easy final act and a desperate one. If you reach the lab with Magnum rounds untouched, the last hour of the game becomes a formality.

Boss Fights Without the Panic

Most RE0 bosses follow the same pattern: they telegraph a charge or a grab, and your job is to sidestep and punish. The exception is the Mimicry Marcus, which demands fire-based damage rather than raw output.

The Queen Leech fight is where most first-time players run dry. If you've been dropping spare sprays in your hub room all game, now is the time to go back and collect them before the point of no return.

Difficulty, Rank, and Unlockables

The game offers three difficulty settings, and your clear rank is influenced by completion time and how often you saved.

Leech Hunter drops you back into the training center to collect 50 green and 50 blue leeches with randomized item placement. It's a short, tense puzzle box and a genuinely good reason to replay. For the official game listing and platform details, see Capcom's official Resident Evil portal.

FAQ

Do I really need a Resident Evil 0 walkthrough to finish the game on Normal? No, but you'll save hours. The game's difficulty comes from inventory logistics rather than combat skill, and knowing where items persist prevents the backtracking spiral that frustrates most newcomers.

Can Rebecca and Billy share items? Yes. When they're standing next to each other, you can hand items back and forth directly. This is much faster than dropping an item and having the other character pick it up.

Should I play Resident Evil 0 before the 2002 remake of the original? Playing RE0 first is chronologically accurate, but the remake is the gentler introduction to classic-style Resident Evil. Many players recommend the remake first and RE0 second.

How long does a typical playthrough take? Most first-time players finish in roughly ten to twelve hours. A Resident Evil 0 walkthrough-informed second run, with foreknowledge of item placement and boss patterns, can cut that down considerably.

Follow the discipline, trust the drop system, and keep your Magnum dry until the lab. That's the whole game in one sentence.