How to Download and Install Pokémon Yellow Legacy Safely

Pokémon Yellow Legacy is distributed as a patch for Pokémon Yellow rather than as a complete Game Boy or Game Boy Color ROM. To install it correctly, you need a clean copy of the supported English Pokémon Yellow base game, the official Yellow Legacy patch, a compatible patcher, and a Game Boy/Game Boy Color emulator.

As of August 2026, the current official release is Pokémon Yellow Legacy v1.0.10. GitHub still marks v1.0.10 as the latest release, and the project considers Yellow Legacy a complete game rather than an unfinished beta.

There is one installation detail that has changed since Yellow Legacy originally launched in 2024.

Older Yellow Legacy guides—including the original release instructions—refer to an IPS patch. The Legacy team has since moved its current distribution to BPS patches and also supports Hackdex as an easier patching method. A March 2026 response from the Legacy team specifically notes that BPS is now used instead of IPS.

So if you are installing Yellow Legacy today, follow the current BPS/Hackdex process rather than assuming an old YouTube tutorial is still exact.

Rom Professor does not provide, host, or link to copyrighted Pokémon Yellow ROM files or pre-patched Pokémon Yellow Legacy ROMs. This guide explains how to apply the official fan-made patch to a clean Pokémon Yellow ROM that you legally obtained yourself.

What You Need Before Installing Pokémon Yellow Legacy

You need:

A clean English Pokémon Yellow ROM
The current Pokémon Yellow Legacy v1.0.10 patch
A BPS-compatible patcher, or Hackdex
A compatible Game Boy/Game Boy Color emulator
A way to extract ZIP files if necessary
A safe location for your clean ROM and save backups

The installation process is basically:

Clean Pokémon Yellow + Yellow Legacy patch = Pokémon Yellow Legacy

The finished game will normally end in:

.gb

or:

.gbc

depending on how your file is named.

That finished game file is what you open in your emulator.

Do not try to open:

A .bps patch
An old .ips patch
A ZIP containing the patch
A save file

directly in the emulator.

Those files are not complete games.

What Base ROM Does Pokémon Yellow Legacy Use?

Pokémon Yellow Legacy expects the standard English Pokémon Yellow ROM commonly identified as:

Pokemon Yellow (UE) [C][!].gbc

The most important identifier is its SHA-1 hash:

cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

That is the exact Pokémon Yellow ROM produced and documented by the well-known pret Pokémon Yellow disassembly project.

The Yellow Legacy developers also explicitly list that same SHA-1 as the required base ROM.

Their v1.0.10 release instructions say that if your Pokémon Yellow ROM does not have:

SHA-1: cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

then your file is modified, incompatible, or otherwise not the expected clean base.

This is one of the most useful pieces of installation information for Yellow Legacy.

Do not depend entirely on the filename.

Someone can rename any ROM:

Pokemon Yellow (UE).gbc

without changing the underlying data.

The checksum tells you what the file actually is.

Correct Yellow Legacy Base ROM

Item	Required Value
Game	Pokémon Yellow Version
Region	English USA/Europe
Common name	Pokémon Yellow (UE) [C][!]
SHA-1	`cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1`
Platform	Game Boy / Game Boy Color
Clean ROM required?	Yes

Do not use:

Pokémon Red
Pokémon Blue
Japanese Pokémon Yellow
A translated Pokémon Yellow ROM
Yellow Legacy+
Pokémon Cursed Yellow
Another Yellow ROM hack
An already patched Yellow Legacy ROM
A ROM with cheats or modifications permanently applied
A ZIP archive instead of the extracted game file

Start with the clean English Pokémon Yellow base.

What Should the Finished Yellow Legacy ROM Hash Be?

The developers also provide a checksum for a correctly patched v1.0.10 ROM.

A correct Yellow Legacy v1.0.10 build should have:

SHA-1: 2ac87de42afc70ef6016805acb3b206644417f97

The official v1.0.10 release notes specifically tell players to verify both the clean base and final patched game.

That gives you an excellent troubleshooting process.

If your base ROM matches:

cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

and your finished game matches:

2ac87de42afc70ef6016805acb3b206644417f97

then your Yellow Legacy installation is almost certainly patched correctly.

Where to Get the Official Pokémon Yellow Legacy Patch

The primary source is the official Yellow Legacy GitHub repository maintained by the Legacy development team.

Official Pokémon Yellow Legacy GitHub repository

The repository describes Yellow Legacy as TheSmithPlays and the Legacy team’s faithful overhaul of Pokémon Yellow, focused on improving balance and quality of life while preserving the original Generation 1 experience.

For versioned releases, use:

Official Pokémon Yellow Legacy releases

GitHub currently marks:

Release 1.0.10 Bugfix and Parity Update

as the latest official release.

The Legacy community also maintains documentation through its subreddit and Discord.

The spreadsheet brief for this article specifically identifies the Legacy documentation as a primary source, and the Legacy moderators continue to direct players there for current game documentation.

What About Hackdex?

Hackdex is now another supported installation route.

In March 2026, the Legacy team told a player following the original Yellow Legacy release instructions that:

Current patches now use BPS
GitHub contains the official files
Hackdex can also be used for easier patching

If Hackdex presents the Yellow Legacy entry and asks you to provide your own Pokémon Yellow ROM, that can simplify installation because it handles the patch selection for you.

The underlying rule remains the same:

You supply your clean Pokémon Yellow ROM.

Hackdex supplies/applies the hack data.

Avoid Pre-Patched Pokémon Yellow Legacy ROMs

The Legacy team specifically discourages downloading pre-patched Yellow Legacy ROMs.

One reason is legal distribution.

Another is that you may not actually receive the game you think you downloaded.

The developers issued a specific warning about Yellow Legacy+, a separate community fork based on Yellow Legacy. They explained that people downloading random pre-patched ROMs sometimes ended up with a modified version rather than the official Yellow Legacy release.

That same problem applies to other community modifications.

You may find versions that change:

AI
Pokémon locations
Badge boosts
Stat EXP
Fly compatibility
Pikachu behavior
Player sprites
Difficulty
Encounter tables

Those can be perfectly valid fan projects.

But they are not the standard Pokémon Yellow Legacy v1.0.10 installation covered by this guide.

Patching your own clean Yellow ROM makes it much easier to know exactly what you are playing.

What Is the Latest Version of Pokémon Yellow Legacy?

As of August 29, 2026, the latest official release remains:

Pokémon Yellow Legacy v1.0.10

GitHub marks 1.0.10 as the latest release.

Version 1.0.10 is primarily a bug-fix and parity update.

Changes include:

Fixing the Viridian Gym music problem after speaking to Giovanni
Allowing Exeggcute and Exeggutor to learn Dream Eater by TM
Allowing Cubone and Marowak to learn Swords Dance
Additional Nidorina move compatibility
Move-value parity adjustments with Crystal Legacy
PP-restoration bug fixes
Several inherited Generation 1 bug fixes

The current completed Yellow Legacy game remains v1.0.10 rather than an experimental 1.1 or 2.0 release.

For future changes, see our Pokémon Yellow Legacy latest version guide.

How to Patch Pokémon Yellow Legacy

There are now two practical installation methods:

Use Hackdex.
Apply the current BPS patch manually.

For beginners, Hackdex is the easiest.

For players who want full control over the files, Rom Patcher JS is excellent.

Method 1: Install Pokémon Yellow Legacy With Hackdex

The Legacy team began supporting Hackdex after the original release, and current community instructions identify it as the easy patching option.

Step 1: Prepare Your Clean Pokémon Yellow ROM

Locate your legally obtained Pokémon Yellow ROM.

Before doing anything else, verify:

SHA-1: cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

If the SHA-1 is different, do not continue.

You have the wrong base.

Step 2: Select Pokémon Yellow Legacy

Open the current Yellow Legacy listing through Hackdex.

Choose the normal official Yellow Legacy game rather than a similarly named community fork.

Step 3: Select Your Pokémon Yellow ROM

Hackdex will ask you to provide the base ROM.

Choose your clean Pokémon Yellow file.

The patching process happens using the ROM you provide rather than giving you somebody else’s copyrighted pre-patched copy.

Step 4: Apply the Patch

Allow Hackdex to patch the game.

The finished output should be a playable Game Boy/Game Boy Color ROM.

Step 5: Save the Patched File Somewhere Permanent

Give it an obvious name, such as:

Pokemon Yellow Legacy.gbc

or:

Pokemon Yellow Legacy 1.0.10.gbc

Choose the filename before beginning your playthrough if possible.

Many emulators associate save files with the ROM’s filename.

Step 6: Open It in Your Emulator

Import the patched game into your chosen emulator.

You should see Pokémon Yellow Legacy rather than ordinary Pokémon Yellow.

Method 2: Patch Pokémon Yellow Legacy Manually With BPS

The Legacy team now uses BPS for current patch distribution. This is different from the IPS instructions that appeared when Yellow Legacy originally released.

Step 1: Download the Official Patch Package

Use the official Yellow Legacy GitHub release resources.

Extract the downloaded package if necessary.

Look for the current:

.bps

patch.

Do not accidentally grab:

Source code
Documentation only
An old IPS patch from a 2024 mirror
A community fork

Step 2: Prepare the Clean Yellow ROM

Your Pokémon Yellow base should have:

SHA-1: cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

Keep an untouched backup.

For example:

Pokemon Yellow CLEAN.gbc

Use a copy for patching.

Step 3: Open Rom Patcher JS

The Yellow Legacy developers have long recommended Rom Patcher JS, and the current release notes still link to it as the patching tool.

Open Rom Patcher JS

Step 4: Select Your Pokémon Yellow ROM

Under the ROM field, select your clean Pokémon Yellow file.

Rom Patcher JS will calculate information about the ROM.

Verify that its SHA-1 matches:

cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

Step 5: Select the Yellow Legacy BPS Patch

Under the patch field, select the current Yellow Legacy:

.bps

file.

A BPS patch can validate the source ROM, which makes it harder to accidentally patch an incompatible file.

If Rom Patcher JS tells you the source does not match:

stop.

Do not force the patch.

Check your Pokémon Yellow ROM.

Step 6: Apply the Patch

Choose:

Apply Patch

The browser will create a new game file.

Save the patched output.

Step 7: Rename the Finished Game

A good filename is:

Pokemon Yellow Legacy.gbc

The exact name does not affect the game.

However, using a stable filename helps later when you need to update the ROM while keeping the same save.

Step 8: Verify the Finished SHA-1

For v1.0.10, the final patched ROM should have:

SHA-1: 2ac87de42afc70ef6016805acb3b206644417f97

That checksum is supplied directly by the Yellow Legacy developers.

If yours is different:

repatch before beginning a serious playthrough.

What About the Old IPS Yellow Legacy Patch?

The original May 2024 Yellow Legacy installation instructions used:

.ips

The original community guide told players to:

Extract the patch.
Load Pokémon Yellow into Rom Patcher JS.
Select the .ips.
Apply the patch.
Open the finished .gb or .gbc file.

Those instructions were correct at the time.

Current Legacy distribution has since moved to BPS.

If you are installing Yellow Legacy for the first time today:

use the current BPS or Hackdex method.

You do not need to hunt down the old IPS release.

How to Play Pokémon Yellow Legacy on Windows

For Windows, my first recommendation is:

mGBA

The Yellow Legacy release community specifically recommended mGBA for PC, and more recent Legacy players continue to use it successfully.

To play:

Install mGBA.
Open mGBA.
Load Pokemon Yellow Legacy.gbc.
Configure your keyboard or controller.
Start playing.
Make a normal in-game save.
Restart once to verify the save.

Although the name mGBA makes it sound GBA-only, it also supports Game Boy and Game Boy Color games.

What About BGB?

BGB is another excellent Windows option, particularly if you are interested in:

Accurate Game Boy Color emulation
Link-cable functionality
Trading
Technical debugging

Yellow Legacy players have successfully used BGB for trading between Generation 1 and Generation 2 games.

For ordinary single-player use, mGBA is simpler.

How to Play Pokémon Yellow Legacy on Mac

For macOS, good options include:

SameBoy

and:

mGBA

SameBoy specializes in Game Boy and Game Boy Color emulation.

mGBA is convenient if you also play GBA Pokémon hacks.

The process is straightforward:

Open your emulator.
Load the patched .gbc.
Configure controls.
Create a normal save.
Close the emulator.
Relaunch.
Confirm the save loads.

How to Play Pokémon Yellow Legacy on Android

The original Yellow Legacy community recommendation for Android was:

My OldBoy!

Current players also commonly use:

RetroArch
Pizza Boy
GBC.emu
Other modern Game Boy Color emulators

For a simple standalone experience:

My OldBoy!

is an easy choice.

For players who already use RetroArch:

SameBoy or Gambatte

are good Game Boy Color cores.

Android Installation

Patch Yellow Legacy first.
Save the resulting .gbc or .gb on your phone.
Open the emulator.
Add a game.
Select Yellow Legacy.
Start playing.
Make a normal in-game save.

Do not try to add the:

.bps

file as the game.

How to Play Pokémon Yellow Legacy on iPhone and iPad

For iPhone and iPad:

Delta works very well with Yellow Legacy.

Delta was the original community recommendation for iOS, and numerous Yellow Legacy players have completed full playthroughs using it.

To use Delta:

Patch Yellow Legacy first.
Save the completed ROM in Files.
Open Delta.
Press the + button.
Choose Files.
Select the Yellow Legacy .gb or .gbc.
Start playing.

Delta supports fast-forward, which is particularly useful for Generation 1 battle pacing and grinding.

Patch First, Import Second

Delta does not turn a BPS patch into Yellow Legacy automatically.

You need the finished ROM first.

The order is:

Yellow ROM → Patch → Yellow Legacy ROM → Delta

not:

Yellow Legacy BPS → Delta

Can You Play Pokémon Yellow Legacy on a 3DS?

Yes.

A modded Nintendo 3DS can run Game Boy/Game Boy Color titles using appropriate homebrew or Virtual Console-style setups.

Legacy community members have reported running Yellow Legacy on 3DS successfully, although individual setups may introduce quirks depending on which emulator or VC method is used.

Because 3DS configurations vary considerably, test:

Battery saving
Audio
Pikachu’s cry
Suspend/resume behavior

before relying on the setup for a long playthrough.

Can You Play Pokémon Yellow Legacy on Real Hardware?

Yes, with compatible Game Boy/Game Boy Color flash hardware.

The finished Yellow Legacy ROM behaves like a modified Game Boy Color-compatible Pokémon Yellow game.

Compatibility depends on the exact:

Flashcart
Cartridge hardware
Firmware
Save support

Make a test save and reboot the hardware before beginning a serious playthrough.

Best Emulator Settings for Pokémon Yellow Legacy

Yellow Legacy does not require complicated emulator configuration.

For most players:

Use an accurate emulator and leave the core settings alone.

A practical setup looks like this:

Setting	Recommendation
System	Game Boy / Game Boy Color
Windows	mGBA or BGB
Mac	SameBoy or mGBA
Android	My OldBoy!, RetroArch, GBC.emu
iPhone/iPad	Delta
Save type	Automatic
Normal in-game saves	Yes
Save states	Convenience only
Fast-forward	Optional
Save backups	Recommended

Use Normal In-Game Saves

Save states are useful.

They are not a replacement for the actual Pokémon Yellow save file.

The normal battery save is what you should preserve when:

Updating Yellow Legacy
Moving between emulators
Moving to another device
Trading
Backing up progress
Replacing the ROM

The Legacy developers specifically give update instructions around the normal in-game save rather than emulator save states.

Keep occasional backups.

Generation 1 saves are tiny.

There is almost no downside to having several copies.

How to Update Pokémon Yellow Legacy Without Losing Your Save

Yellow Legacy v1.0.10 is currently the latest official version, so a brand-new installation does not need updating.

However, older builds such as:

1.0
1.0.3
1.0.9

still circulate.

The developers explicitly state that older saves should work with newer Yellow Legacy bug-fix releases, but they provide several important precautions.

Step 1: Save Inside a Pokémon Center

This is critical.

Before updating:

go inside a Pokémon Center.

Then make a normal in-game save.

The Yellow Legacy team specifically warns players to save in a Pokémon Center before updating or risk corrupting the save.

And they mean an actual Pokémon Center.

The v1.0.9 update announcement specifically emphasized:

Not the Pokémon League
Not Mom’s house
Use a Pokémon Center

because Pokémon Centers are the safest map locations for save migration.

Step 2: Close the Emulator

After saving in the Pokémon Center:

close your emulator completely.

Do not keep playing after creating the update save.

Step 3: Back Up Your Save

Find the normal battery save.

It may end in:

.sav

or use another emulator-specific extension.

Make a copy.

For example:

Pokemon Yellow Legacy BACKUP.sav

Keep the backup separate.

Do not test an update using the only copy of your save.

Step 4: Keep the Old Yellow Legacy ROM

Also keep your previous:

.gb

or:

.gbc

file.

If anything goes wrong, you want to be able to load the backup save in the exact game version that created it.

Step 5: Start From Clean Pokémon Yellow Again

This is the most important updating rule:

Do not apply the newer Yellow Legacy patch over your existing Yellow Legacy ROM.

The developers explicitly warn against doing this.

Return to your clean Pokémon Yellow base:

SHA-1: cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

Apply the newest Yellow Legacy patch to that clean ROM.

Step 6: Give the New ROM the Same Filename

Suppose your existing files are:

Pokemon Yellow Legacy.gbc

and:

Pokemon Yellow Legacy.sav

Name your new v1.0.10 ROM:

Pokemon Yellow Legacy.gbc

Many emulators match the battery save to the game by filename.

If you instead name the ROM:

Pokemon Yellow Legacy 1.0.10.gbc

your emulator may create a brand-new blank save because it cannot find:

Pokemon Yellow Legacy 1.0.10.sav

Step 7: Launch the Updated Game

Open the newly patched ROM.

Choose:

Continue

Check:

Your party
PC Pokémon
Items
Pokédex
Badges
Story progress
Money
Pikachu
Trainer information

Everything should appear normal.

Step 8: Save Again

Once the update is running correctly:

make another normal in-game save.

Then:

Close the emulator.
Reopen Yellow Legacy.
Load the save again.

Only after doing that should you consider the update successful.

Keep your backup anyway.

Can I Update From Yellow Legacy 1.0 Directly to 1.0.10?

The developers’ v1.0.10 release notes state that saves from previous versions should work fine, provided you use the safe update process.

For maximum safety:

Save in a Pokémon Center.
Back up your save.
Patch clean Pokémon Yellow with v1.0.10.
Reuse the normal battery save.
Test everything before deleting anything.

Do not patch 1.0.10 over the old Yellow Legacy ROM.

Common Pokémon Yellow Legacy Installation Problems

“Rom Patcher says my Pokémon Yellow ROM is wrong”

Check the SHA-1.

The required base is:

cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

If your checksum differs, you have the wrong base.

Do not force the patch.

“I have Pokémon Yellow. Why doesn’t the patch work?”

Not every ROM named:

Pokemon Yellow.gb

is identical.

You may have:

A different region
A translation
A modified dump
A bootleg-derived ROM
Another hack
A patched ROM
A bad dump

The SHA-1 removes the guesswork.

“My patch is BPS but an old tutorial says IPS”

The tutorial is outdated.

Yellow Legacy originally used IPS.

The Legacy team confirmed in March 2026 that current distribution uses:

BPS

and that Hackdex is also available.

Use the current patch.

“Can I still use an old IPS patch?”

An official old IPS release can still create the older build it belongs to, but there is little reason to use it for a new installation.

Use the current v1.0.10 BPS package instead.

“My emulator won’t open the BPS file”

That is normal.

.bps

is not a ROM.

It is a patch.

Apply it to Pokémon Yellow first.

Then open the resulting:

.gb

or:

.gbc

file.

“Can I rename the BPS file to GBC?”

No.

Changing:

Yellow Legacy.bps

to:

Yellow Legacy.gbc

does not apply the patch.

You have only renamed the file.

“I downloaded a ZIP and my emulator doesn’t see it”

Extract the ZIP.

The archive probably contains the patch and documentation rather than a complete playable game.

This confusion appeared frequently after Yellow Legacy originally launched; community support repeatedly explained that the official download contains a patch that must be applied to Pokémon Yellow.

“Normal Pokémon Yellow starts”

You probably opened the clean base.

Look for the new file created by the patcher.

Rename it:

Pokemon Yellow Legacy.gbc

and open that file.

“How do I know if the patch worked?”

Check the final SHA-1.

For v1.0.10:

2ac87de42afc70ef6016805acb3b206644417f97

is the official expected patched hash.

That is far more reliable than guessing from a filename.

“My finished Yellow Legacy hash is wrong”

Repatch.

First verify the base:

cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

Then use the current official Yellow Legacy patch.

If the final hash still differs from the expected v1.0.10 build, check whether you accidentally:

Applied an optional mod
Used an old patch
Patched over Yellow Legacy
Used the wrong patching mode
Modified the output afterward

“The game crashes or behaves strangely”

Try the ROM in:

mGBA

or:

SameBoy

If it works there, you probably have an emulator-specific issue.

Do not automatically repatch the game if the same ROM works in another accurate emulator.

“Yellow Legacy has strange changes that aren’t in the documentation”

You may have downloaded a community fork.

One well-known example is:

Yellow Legacy+

The official Legacy team specifically warns that Yellow Legacy+ is a separate project even though it is based on Yellow Legacy.

Other community variants also exist.

If you want the normal experience:

patch clean Pokémon Yellow using the official Legacy files.

“My save disappeared after updating”

Check the filenames.

If your save is:

Pokemon Yellow Legacy.sav

but your new ROM is:

Pokemon Yellow Legacy 1.0.10.gbc

your emulator may not connect them.

Back up everything.

Then rename or import the save appropriately.

“My save became corrupted after updating”

Did you save in a Pokémon Center first?

The developers specifically warn that updating from other maps carries a higher risk of save corruption.

Return to your backup.

Open it using your old ROM.

Save inside a Pokémon Center.

Then retry the update.

“Can I use a save state to update?”

Do not rely on it.

Use a normal in-game save.

A save state captures the exact emulator and ROM state and is much less portable between game builds.

“Delta can’t find my old save”

Delta stores game saves within its library.

If you imported the new Yellow Legacy ROM as a completely separate game, Delta may have created another game entry rather than automatically using the old save.

Use Delta’s save export/import functionality or make sure you are replacing the existing game entry appropriately.

Back up the save before experimenting.

“My Android emulator doesn’t recognize the game”

Make sure your patched file ends in:

.gb

or:

.gbc

not:

.bps

.ips

.zip

or:

.txt

The original Android installation discussion recommends My OldBoy! and specifically tells players to import the resulting ROM after patching.

“The file ends in .gb instead of .gbc”

That can be fine.

Pokémon Yellow is a Game Boy title with Game Boy Color enhancements, and emulator/file naming conventions vary.

What matters is whether:

The patch applied correctly
The ROM hash is correct
Your emulator recognizes it

Do not arbitrarily rename extensions unless you actually need to.

Can Pokémon Yellow Legacy Trade With Other Games?

Yellow Legacy intentionally retains compatibility with Generation 1-style systems, and its broader Legacy ecosystem includes trade-related considerations with Crystal Legacy.

Players have successfully used mGBA’s multiplayer functionality to trade between Yellow Legacy and Crystal Legacy-style setups. BGB is another good choice for Game Boy/Game Boy Color link emulation.

If trading matters to you:

mGBA or BGB on Windows are strong choices.

Do not assume every mobile emulator supports accurate link-cable emulation.

Are Cheats Safe in Pokémon Yellow Legacy?

Use caution.

Yellow Legacy is designed around Pokémon Yellow’s original engine, but it also changes:

Pokémon availability
Moves
Trainer data
Items
Events
Battle mechanics
Stat behavior
Map scripts

A vanilla Pokémon Yellow cheat may still work, but it is not automatically guaranteed safe.

Community discussions in 2026 continue to distinguish between cheat codes for standard Yellow Legacy and codes for modified forks because memory/data layouts can differ.

Before using cheats:

Back up your normal save.
Test one code at a time.
Prefer codes documented specifically for Yellow Legacy.
Disable cheats after use.
Do not overwrite your backup immediately.

How to Verify That Pokémon Yellow Legacy Installed Correctly

There are three excellent verification methods.

1. Check the Base ROM Before Patching

Your clean Pokémon Yellow ROM should have:

SHA-1: cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

2. Check the Patched v1.0.10 ROM

Your finished game should have:

SHA-1: 2ac87de42afc70ef6016805acb3b206644417f97

If both hashes match, your patching process is correct.

3. Test the Save System

Launch Yellow Legacy.

Start a game.

Make a normal in-game save.

Then:

Close the emulator completely.
Reopen the emulator.
Load Yellow Legacy.
Confirm Continue appears.
Load your game.

If the v1.0.10 hash matches and your normal save survives a complete restart, your installation is ready for a full playthrough.

Pokémon Yellow Legacy Installation FAQ

What is the latest version of Pokémon Yellow Legacy?

As of August 29, 2026, the latest official mainline release is:

Pokémon Yellow Legacy v1.0.10

GitHub marks 1.0.10 as the latest release.

For future updates, see our Pokémon Yellow Legacy latest version guide.

Is Pokémon Yellow Legacy complete?

Yes.

The Legacy team considers Yellow Legacy complete. Community staff confirmed in late 2025 that Yellow Legacy, Crystal Legacy, and Emerald Legacy had fulfilled their intended visions as complete games.

What ROM does Pokémon Yellow Legacy use?

Use the clean English Pokémon Yellow ROM with:

SHA-1: cc7d03262ebfaf2f06772c1a480c7d9d5f4a38e1

This corresponds to:

Pokemon Yellow (UE) [C][!].gbc

Does Yellow Legacy use IPS or BPS?

Current installation uses BPS.

Yellow Legacy originally launched using IPS patches, which is why many older guides say IPS.

The Legacy team confirmed in March 2026 that it now uses BPS files.

Can I use Hackdex?

Yes.

The Legacy team now specifically identifies Hackdex as an easier patching option.

What patcher should I use?

For manual patching:

Rom Patcher JS

remains an excellent choice and is directly recommended in the official Yellow Legacy release notes.

What is the correct v1.0.10 patched ROM SHA-1?

The official final hash is:

2ac87de42afc70ef6016805acb3b206644417f97

Can I download a pre-patched Yellow Legacy ROM?

Pre-patched ROMs circulate online, but Rom Professor does not recommend or link to them.

The Legacy developers specifically warn that pre-patched downloads may even contain community forks such as Yellow Legacy+ rather than the official game.

Patch your own clean Pokémon Yellow copy instead.

What emulator should I use on Windows?

mGBA is my first recommendation.

The Yellow Legacy community originally recommended mGBA for PC, and it remains widely used.

Can I play Yellow Legacy on Mac?

Yes.

Use SameBoy or mGBA.

Can I play Yellow Legacy on Android?

Yes.

The original project recommendation was My OldBoy!, while RetroArch and other modern GBC emulators also work.

Can I play Yellow Legacy on iPhone?

Yes.

Delta works very well with Yellow Legacy and was the project’s original iOS recommendation.

Can I play Yellow Legacy on a 3DS?

Yes, through an appropriate Game Boy/Game Boy Color emulation or injection setup.

Test saving and audio carefully because behavior can depend on the exact 3DS method.

Can I play Yellow Legacy on real hardware?

Yes, with compatible flash hardware.

Make sure battery saving works before starting a long playthrough.

Does Yellow Legacy have all 151 Pokémon?

Yes.

One of Yellow Legacy’s stated design goals is allowing all 151 Generation 1 Pokémon to be obtained in a single playthrough.

Is Yellow Legacy a difficulty hack?

Not in the same sense as a Kaizo hack.

The developers explicitly say Yellow Legacy is not designed as a Kaizo project, although major Trainer battles are harder than vanilla Yellow.

Is Yellow Legacy+ the same game?

No.

Yellow Legacy+ is a separate community fork designed to create a more challenging experience.

The official Legacy team supports the existence of the fork but specifically warns players not to confuse it with standard Yellow Legacy.

What is the correct way to update Yellow Legacy?

The safe update procedure is:

Enter a Pokémon Center.
Make a normal in-game save.
Close the emulator.
Back up the save.
Keep the old ROM.
Patch a clean Pokémon Yellow ROM with the newest Yellow Legacy patch.
Do not patch over your old Yellow Legacy ROM.
Make the new ROM use the filename expected by your save.
Load your save.
Verify everything.
Save again.

The developers specifically require the clean-ROM and Pokémon Center precautions in their update instructions.

Can I update from v1.0.9 to v1.0.10 without restarting?

Yes.

The developers state that old saves should continue working, provided you follow the safe update process.

Should I patch v1.0.10 over my old Yellow Legacy ROM?

No.

The official release notes explicitly say:

patch a clean Yellow ROM again.

Do not stack the new patch onto the existing Yellow Legacy ROM.

Why do I have to save in a Pokémon Center?

Updating can change map and game data.

The Legacy team identified Pokémon Centers as the safest place to leave your character before moving a save between versions. The v1.0.9 announcement specifically warned players not to use locations such as the League or Mom’s house instead.

Where should I go after installing Pokémon Yellow Legacy?

Once the game is running correctly, read our Pokémon Yellow Legacy beginner guide.

Yellow Legacy intentionally preserves the feel—and even many of the strange mechanics—of Generation 1, but the game changes Pokémon availability, movesets, Trainer teams, balance, progression, difficulty options, postgame content, and many quality-of-life systems.

It is familiar enough to feel like Pokémon Yellow, but different enough that knowing the Legacy changes before building your team is extremely useful.

For patch changes and future releases, also see our Pokémon Yellow Legacy latest version guide.