Metroid Fusion Cheat Codes & Secrets

Hard Mode Unlock

Metroid Fusion does not use a password system — it saves progress to the cartridge’s internal battery. All unlockable content is tied to save file completion flags and performance metrics.

Completing the game on Normal difficulty unlocks Hard Mode on that save slot. To start a Hard Mode run, load the completed save file and select the Hard Mode option that appears.

Condition	Unlock
Complete the game (any %)	Hard Mode unlocked on save slot
Complete Hard Mode	Additional gallery artwork

Hard Mode changes:

• All enemy damage is doubled
• Energy and missile pickups restore half the normal amount
• Energy Tanks still grant the full 100 units when first collected
• Boss patterns remain the same, but the reduced healing economy makes resource management far more punishing

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Completion Ending Unlockables

Metroid Fusion tracks both your final clear time and item collection percentage to determine which ending image is displayed after the credits. There are four possible endings, rewarding efficient and thorough players.

Clear Time	Item %	Ending Image
Under 2 hours	100%	Samus in Zero Suit (no power armor)
Under 2 hours	Under 100%	Samus in Fusion Suit, helmet removed
Over 2 hours	100%	Samus facing forward, full suit
Over 2 hours	Under 100%	Standard ending image

The Zero Suit reveal (best ending) requires both sub-2-hour completion and full item collection simultaneously. The total item count across all sectors is 100%, comprising all Missile Tanks, Energy Tanks, and Power Bomb Tanks spread through the BSL Research Station.

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GBA–GameCube Link Cable Secret

One of the most notable secrets in Metroid Fusion is its connectivity feature with Metroid Prime on the Nintendo GameCube. This requires:

• A Game Boy Advance with Metroid Fusion inserted
• A Nintendo GameCube with Metroid Prime in the drive
• An official GBA–GCN Link Cable

Steps to activate:

1. Start Metroid Prime on the GameCube
2. Connect the Link Cable between the GBA and the GameCube controller port
3. Navigate to the Extras menu in Metroid Prime
4. Select GBA Connection
5. The original NES Metroid is transmitted to the GBA cartridge and playable on the GBA screen

The original Metroid streams from the Metroid Prime disc and runs on the GBA hardware. This is a one-directional feature — there is no equivalent unlock sent back to the Metroid Fusion cartridge. The feature is region-specific and requires matching region versions of both games.

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Beneficial Glitches and Exploits

Metroid Fusion has a dedicated speedrunning community that has catalogued several exploits. These work on real hardware and in accurate emulators.

Shine Spark Storage

The Speed Booster’s stored charge (Shine Spark) can be held indefinitely after crouching, allowing Samus to reposition before releasing it.

Method:

1. Build Speed Booster momentum with a full run
2. Press Down to crouch — this stores the Shine Spark charge
3. Reposition Samus to the desired angle
4. Press Up + B, any diagonal + B, or B alone depending on desired direction to launch

Stored Shine Sparks can cross gaps or reach vertical heights that would otherwise require items Samus has not yet collected, enabling major sequence breaks in sector navigation.

Wall Jump

Wall jumping is an intentional mechanic but one many players overlook. Samus can climb vertical shafts and bypass barriers using it.

Inputs:

1. Jump toward a wall with B
2. When Samus’s sprite touches the wall, press the opposite direction simultaneously with B again
3. Repeat to chain wall jumps upward

This technique allows early access to certain rooms and can be chained indefinitely on parallel walls.

Infinite Bomb Jump

Using the Morph Ball and Bombs, Samus can gain significant vertical height by chaining bomb detonations.

Method:

1. Enter Morph Ball mode (Down + B)
2. Lay a Bomb (A)
3. As the explosion launches Samus upward, lay the next bomb at the peak of the arc
4. Repeat the timing to climb continuously

Unlike Super Metroid’s diagonal bomb jump, Fusion’s IBJ is strictly vertical and requires tight timing. It is primarily used to access out-of-reach tunnels and crawlways in sequence-break routes.

Early Power Bomb Acquisition

Using precise bomb jumping and Speed Booster storage in specific sector corridors, experienced players can collect Power Bomb Tanks before completing the required ADAM authorization missions. This does not grant the ability to use Power Bombs early — the weapon remains locked until ADAM unlocks it — but it completes collection percentage ahead of schedule.

SA-X Encounter Manipulation

During scripted SA-X chase sequences, the SA-X pathfinding can be manipulated by using specific rooms as choke points. The SA-X follows a fixed behavior tree; entering certain doorways forces it to take longer pathing routes, giving Samus time to escape without taking damage. This is particularly useful in the Sector 2 (TRO) encounter where the narrow corridors create predictable AI routing.

Out-of-Bounds Ledge Clips

In a small number of room transitions, Samus can clip through thin ledge geometry by combining a morph ball roll with precise horizontal positioning against a wall corner. These are frame-precise on hardware and primarily documented in TAS (tool-assisted speedrun) contexts rather than real-time play.

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Game Shark and Action Replay Codes (USA Version)

The following codes apply to the North American release (Game ID: AMFE). Always verify codes against your cartridge region before using — European and Japanese versions use different memory addresses.

Code	Effect
82026224 0260	Max Energy (608 units)
82026228 03E7	Max Missiles (999)
8202622C 03E7	Max Power Bombs (999)
33000580 00FF	All major upgrades collected
330057A0 00FF	All missile/energy tanks registered

Enter codes through your cheat device’s interface before booting the cartridge. Codes that set item flags directly may cause ADAM briefing dialogue to behave unexpectedly if triggered before in-game story events that normally grant those items.

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Developer Details and Easter Eggs

ADAM’s Dialogue Callbacks

The navigation AI ADAM makes several self-referential remarks throughout the game that nod to the original Metroid and Super Metroid plots. Players who read every briefing screen carefully will find ADAM acknowledges Samus’s history with the Space Pirates and Mother Brain, framing the BSL outbreak as a callback to the events of Super Metroid. These are scripted story beats rather than hidden content, but many players miss them by skipping dialogue.

Hidden Room in Sector 6 (NOC)

A sealed room in Sector 6 accessible only after all Omega Metroid larvae have been absorbed contains environmental texture work that goes unlit during normal play — the room is entered briefly during a story sequence but the background detail is only visible when brightness is turned up on the GBA SP or in emulation with gamma correction. The room depicts an early-stage X Parasite colony that mirrors the opening cutscene layout, suggesting it was intended as a thematic mirror of the game’s beginning.

The Final Omega Metroid

The Omega Metroid that appears in Sector 1 before the endgame is deliberately framed at the same scale and in the same posture as the final Metroid larva from Super Metroid. This visual callback was confirmed in Japanese gaming publications at the time of release as an intentional decision by the development team to signal narrative continuity.

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Speedrun Category Notes

For players interested in competitive time attack, Metroid Fusion has three primary categories recognized by the speedrunning community:

Category	Goal
Any%	Fastest possible credits roll, all sequence breaks allowed
100%	All items collected before triggering credits
Hard Mode Any%	Any% rules applied to Hard Mode save file

The Any% world record route makes heavy use of Shine Spark storage to bypass large sections of sector backtracking and skips several ADAM briefing rooms by entering and exiting them at the minimum required moment to register story flags. Sub-1-hour completions are achievable with the current known route on real hardware.