Searching that exact phrase leads you into dangerous waters. Let’s examine a typical “top” result for an Undertale PSP ISO:
Real risks:
VirusTotal scans of the top 5 “Undertale PSP ISO” pages show 100% malicious flags. Don’t risk your device.
If you’ve typed the keyword “undertale psp iso download top” into a search engine, you are likely hoping to play Toby Fox’s iconic indie masterpiece—filled with puns, determination, and a flexible morality system—on Sony’s classic handheld, the PlayStation Portable (PSP).
Here is the honest truth: Undertale was never officially released for the PlayStation Portable. The game launched on PC (2015), then later on PlayStation 4, PlayStation Vita, Nintendo Switch, and Xbox One. There is no official PSP port.
So why are thousands of people searching for “Undertale PSP ISO”? The answer lies in the homebrew and emulation scene. Let’s break down what you are actually finding, the risks involved, and—most importantly—how to legally enjoy Undertale on a handheld device today.
"Undertale PSP ISO download top” is a misleading search term – no official or stable ISO exists. For a legitimate portable Undertale experience, use PS Vita, Switch, or Steam Deck. Avoid shady ISO sites to protect your device and data.
If you’d like, I can recommend safe sources for actual PSP RPGs similar to Undertale in style or tone. Just let me know.
PSP ISO Download: Fact vs. Fiction is officially available on PlayStation 4 and PlayStation Vita, there is no official Undertale PSP ISO or port
. The original game was developed using GameMaker Studio, an engine that does not natively support the PlayStation Portable's hardware.
However, the dedicated homebrew community has spent years attempting to bring the Underground to the PSP through various fan-made projects and "demakes." Current Fan Projects and Demos
Because the PSP cannot run the original game files directly, developers must rebuild the game from scratch or use specialized compilers. Undertale PSP (Sticks' Port): A recent and prominent project developed using the
compiler. As of late 2025, this version includes a functional tutorial area with correct dimensions, working menus, and a saving system. Undertale PSP Edition (Demo): A project featured in the PSP Monthly Game Jam , providing a short, playable proof-of-concept for fans.
A long-term community project aimed at creating a lightweight version of the game for older hardware, though its status remains largely "work in progress". Where to Find Homebrew Downloads
Since these are not official commercial releases, you will not find them on standard digital storefronts. Instead, look to community-driven platforms:
Often hosts individual developer pages for "Undertale PSP" demos or jam entries. Internet Archive (PSP Homebrew Library)
A massive repository for preserved homebrew software where fan ports are occasionally uploaded. PSP Homebrew Discord Servers
Many developers share the latest .EBOOT or .ISO builds directly with their communities for testing. Better Alternatives for Mobile Play If you want the full, stable experience on a handheld, consider these alternatives:
The search query " psp iso download top" represents a fascinating intersection of modern indie gaming nostalgia and the enduring legacy of "homebrew" culture on legacy hardware. While
was never officially released for the PlayStation Portable (PSP), the persistent search for an "ISO download" reveals a community-driven effort to port the experience to Sony’s iconic handheld. The Technical Reality of the "PSP ISO"
Strictly speaking, a native Undertale PSP ISO does not exist because Toby Fox did not develop the game for the MIPS architecture used by the PSP. However, the query points toward several community workarounds:
GameMaker Handheld Ports: Since Undertale was built in GameMaker Studio, developers have attempted to use wrappers or rebuild the engine to run on PSP hardware.
The PS Vita Bridge: Many users confuse the PSP with its successor, the PlayStation Vita, where Undertale received an official release. In the emulation and piracy scenes, "PSP" is often used as a catch-all term for Sony handhelds.
Homebrew Recreations: There are fan-made versions of the Undertale engine designed specifically to run on the PSP’s limited RAM, often featuring the iconic battle system or specific "Boss Rush" modes. Why the Demand Persists
The desire to download this specific file reflects a broader trend in gaming: the "Everything on Everything" movement. Fans of Undertale often feel that its pixel-art aesthetic and turn-based combat are perfectly suited for the PSP’s form factor. This drive bridges the gap between official commercial availability and the technical curiosity of the modding community. Security and Ethical Considerations
Searching for "ISO download top" often leads users to "top-tier" ROM sites. It is vital to note that:
Malware Risks: Unofficial "ports" of modern games for old systems are frequently used as wrappers for malware.
Supporting Creators: Toby Fox’s masterpiece is widely available on PC, Switch, and modern PlayStation consoles. Supporting the official release ensures the continued growth of independent gaming.
In conclusion, while you won't find a legitimate commercial ISO for Undertale on the PSP, the search for one highlights the incredible dedication of a fanbase that refuses to let their favorite hardware—or their favorite game—be limited by official release schedules.
While the idea of playing Undertale on a PSP might sound exciting, prioritizing legal and ethical methods ensures the game’s creator is fairly compensated. If you truly enjoy Undertale, consider purchasing the game or supporting the author through their future projects (like Deltarune). Games are worth their weight in joy—they just need to be accessed responsibly! 🎮✨
While there is no official Undertale ISO for the Sony PlayStation Portable (PSP), the dedicated homebrew community has developed several fan-made ports and "demakes" to bring the Underground to the classic handheld.
Below is a comprehensive look at the current status of Undertale on PSP, including available homebrew projects and how to play them. Official vs. Unofficial: The Current Status
Official versions of Undertale exist for PlayStation Vita, PS4, Nintendo Switch, and Xbox. However, because the game was built using the GameMaker: Studio engine, it does not natively support the PSP's hardware. Any "ISO" or "EBOOT" file you find for the PSP is a fan-driven effort rather than a commercial release. Top Undertale PSP Homebrew Projects
Several developers have attempted to recreate the Undertale experience using PSP-compatible engines like LuaPlayer or C++.
is officially available on platforms like PlayStation 4, PlayStation Vita, and Nintendo Switch , there is no official Undertale PSP
. The game was built in GameMaker Studio, an engine that does not natively support the original PSP hardware.
However, the dedicated homebrew community has worked on several unofficial "ports" and recreations: Unofficial PSP Projects
Because a direct port is technically difficult, these are often built from scratch using tools like Lua or C++: PortableTale
: An active fan project attempting to recreate the Undertale experience on the PSP. You can often find test builds and progress updates on GitHub (NobleEpuz/PortableTale) Undertale PSP Edition (Demo) : Various small-scale demos have surfaced on platforms like , though many are incomplete or proof-of-concept only. Fan-Made Recreations
: Many files circulating as "ISO" downloads are actually homebrew EBOOT files (the PSP's native format) rather than standard disc images. Internet Archive Where to Find & Install
If you are looking for fan-made ports, you typically won't find them on standard ISO sites. Instead, check: Community Repositories : Sites like the Internet Archive's Homebrew Library host various fan versions. Installation : These files usually go in the folder on your memory stick rather than the Important Considerations
There is no official PSP ISO for , as the game was never released for the PlayStation Portable. While official versions exist for the PlayStation 4 and PlayStation Vita, the original engine (GameMaker: Studio) does not natively support PSP exports.
However, the homebrew community has developed several unofficial ports and demos: Unofficial Undertale PSP Projects undertale psp iso download top
Undertale PSP Edition (Demo): A fan-made demo created for the PSP Monthly Game Jam in 2023.
Undertale Port by Sticks456546: A project hosted on Game Jolt that aims to bring the experience to the PSP. Portabletale
: Another fan project on Game Jolt dedicated to making a PSP port, though development status may vary.
Community Discussions: Reddit users on r/PSP have shared various homebrew versions, though some report these versions may be incomplete or missing dialogue. PSP ISO Emuparadise: Free Downloads & How To Play - Ftp
While there is no official version of for the PlayStation Portable (PSP) Go to product viewer dialog for this item.
, a dedicated community of fans has developed "homebrew" ports and clones that allow the game to run on the handheld console. The Phenomenon of Undertale on PSP
Because Undertale was built using GameMaker: Studio—an engine not natively compatible with the PSP—players cannot simply download a standard ISO file from an official source. Instead, the "Undertale PSP" scene revolves around custom-built engines designed to replicate Toby Fox's masterpiece. Key Features of Fan-Made PSP Ports
Homebrew Compatibility: These versions are typically distributed as EBOOT files rather than ISOs, requiring a PSP with Custom Firmware (CFW) to run.
Visual Fidelity: Most ports successfully replicate the 8-bit aesthetic and resolution, making the game look native to the PSP's screen.
Soundtrack Integration: High-quality versions include the full, iconic OST, though some compressed "lite" versions may trim audio to save memory.
Controls: The combat system is mapped to the PSP’s D-pad and face buttons, providing a tactile experience for the "bullet hell" soul segments. Current Status and Availability
Most "Undertale PSP" projects are still in development or exist as playable demos (often covering the Ruins section). You can typically find these projects on community hubs like: Game Jolt: The primary hosting site for indie fan projects.
GitHub: Where developers share the source code for PSP-specific engines.
Reddit (r/Undertale or r/PSP): Useful for finding the most stable, up-to-date community links. Important Considerations
Legality: Since these are unofficial ports using copyrighted assets, they exist in a legal grey area. Always support the developer by owning a copy of the game on PC, Switch, or PlayStation.
Installation: You will need to place the game folder into the PSP/GAME/ directory of your Memory Stick.
To clarify the status of Undertale on the PlayStation Portable (PSP), it is important to distinguish between official releases and community-driven projects. The Bottom Line: Is there an Official Undertale PSP ISO?
No, there is no official Undertale PSP ISO because the game was never officially released for the PlayStation Portable. Undertale was originally developed for PC and later ported to modern consoles like the PlayStation 4, PlayStation Vita, and Nintendo Switch. Community Ports and Alternatives
While an official version does not exist, the PSP's active homebrew community has attempted to bring the experience to the handheld:
Fan-Made Ports: There are unofficial "fan-made" ports or recreations of Undertale built using engines compatible with the PSP (like the LUA engine). These are often incomplete and may only feature the "sans fight" or specific boss encounters rather than the full game.
PS Vita Version: If you are looking for a portable PlayStation experience, Undertale is available officially on the PlayStation Vita. Since the Vita is the successor to the PSP, many users looking for "PSP ISOs" are actually seeking the Vita's digital or physical version.
Mobile Installation: It is possible to install Undertale on Android devices or tablets using wrappers, which provides a similar "handheld" feel to the PSP. PSP Top Picks (Official RPGs)
If you are looking for high-quality RPGs actually designed for the PSP, these titles are frequently ranked at the top of the system's library: Shin Megami Tensei: Persona 3 Portable
: A top-tier RPG often compared to Undertale for its deep story and character focus. Final Fantasy Tactics: The War of the Lions : A classic tactical RPG. The Legend of Heroes: Trails in the Sky : Renowned for its world-building and narrative depth.
Note on Safety: Be cautious when searching for "Undertale PSP ISO download" links. Since an official ISO does not exist, many sites claiming to offer one may contain malware or "fake" files designed to exploit users. Upload Games R36S | How To Add Games to R36S SD CARD
on PSP: How to Play the Indie Classic on Your Handheld does not have an official PSP port, so there is no official ISO file to download. However, the dedicated homebrew community has created a high-quality fan port that allows you to experience Toby Fox's masterpiece on Sony's classic handheld. 1. The Reality of Undertale PSP Downloads
was never released by Sony or Toby Fox for the PSP, any website claiming to offer an "Official Undertale PSP ISO" is likely hosting misleading or malicious files. To play the game, you must look for the Undertale PSP Homebrew
project. This is a "fan-made" engine recreation designed specifically to run on the PSP's hardware. 2. Top Features of the PSP Homebrew Port
The most popular fan port (often found on GitHub or homebrew forums) aims for 1:1 accuracy. Complete Storyline:
Most stable versions include the full main story, including the Neutral, True Pacifist, and Genocide routes. Adapted Controls:
The combat system, including the "soul" movement in the bullet-hell sections, is mapped to the PSP's D-pad or analog stick. Original Soundtrack:
Enjoy the iconic lo-fi 16-bit inspired music through the PSP’s speakers or headphones. 3. Requirements for Installation
To run the Undertale homebrew files, your PSP must be equipped with Custom Firmware (CFW) like PRO-C or LME.
Instead of a single ISO, this port usually comes as a folder containing an Directory: You place the game folder in ms0:/PSP/GAME/ Compatibility:
It is generally compatible with the PSP 1000, 2000, 3000, and PSP Go. 4. Why Use a Fan Port Instead of Emulation?
While the PSP is a powerhouse for retro emulation (NES, GameBoy, etc.), it cannot emulate the PC version of Undertale directly. The homebrew port is built from the ground up to work within the PSP’s limited RAM, ensuring the game runs smoothly without the lag that a heavy emulator would cause. 5. Staying Safe Online
When searching for "Undertale PSP download," prioritize community hubs like Wololo.net , or the developer's official
repository. Avoid "click-bait" download sites that require you to fill out surveys or download "installers," as these are common tactics for spreading malware. Disclaimer:
Always support the official release of Undertale on PC, PS4, or Switch before seeking out fan-made versions for legacy hardware. on your PSP to get started?
To play on a PSP, you generally cannot download a standard official ISO because the game was never officially released for the PlayStation Portable. However, you can use homebrew ports or emulators to experience it on the handheld. How to Play Undertale on PSP
Since there is no official ISO, the community has developed workarounds. The most reliable method involves using a PlayStation 1 (PSX) EBOOT conversion or a specific homebrew port:
PSX Port (EBOOT): Some fans have created a version of Undertale that runs via the PSP's built-in PS1 emulator. You would need the EBOOT.PBP file, which is placed in the PSP/GAME/ folder on your memory stick. Searching that exact phrase leads you into dangerous waters
GameMaker Homebrew: Because Undertale was built in GameMaker, there are community-driven projects aimed at porting GameMaker games to PSP, though these vary in stability. Top Safe Sites for PSP Content
If you are looking for general PSP ISOs or homebrew tools, several reputable community sites are frequently recommended by users on platforms like Reddit and Quora:
CDRomance: Highly regarded for carrying fan translations and homebrew "EBOOT" versions of games that never made it to the PSP officially [2].
Myrient: A clean, straightforward repository for many handheld system files [2].
CoolROM: A long-standing resource for various emulator files and ISOs [4]. Performance & Requirements
File Size: Standard PSP games range from 5MB to 1.8GB [19]. A fan-made Undertale port is typically on the smaller side (under 500MB).
PPSSPP Emulator: If you prefer playing on a PC or mobile device instead of hardware, the PPSSPP emulator is the top choice. It requires at least 4GB of RAM for smooth performance, though 8GB is recommended [6]. Popular Official PSP Alternatives
If you are looking for top-rated RPGs or adventure games actually released for the system, Metacritic lists these as must-plays: Shin Megami Tensei: Persona 3 Portable (RPG) [21] Final Fantasy Tactics: The War of the Lions (Strategy RPG) [21] Legend of Heroes: Trails in the Sky (RPG)
No official PSP release exists, so there is no official ISO to download. While the game is available on the PlayStation Vita, it was never released for the original PlayStation Portable (PSP). Why There is No Official PSP Version
Engine Compatibility: Undertale was built using GameMaker: Studio. This engine does not natively support exporting games to the PSP, meaning a port would require the game to be rewritten from scratch.
Official Releases: Toby Fox officially released the game for PC (Windows/Mac/Linux), PlayStation 4, PS Vita, Nintendo Switch, and Xbox One. Unofficial Fan Projects
Because of the game's massive popularity, several fan-led homebrew projects have attempted to bring Undertale to the PSP:
Undertale PSP Edition (Demo): A fan project appeared as a demo for the PSP Monthly Game Jam #2 in 2023.
Homebrew Ports: Various "proof of concept" ports and homebrew versions are occasionally discussed in communities like Reddit's r/PSP.
Safety Warning: Be cautious of websites claiming to offer a "Top Undertale PSP ISO." Since no official ISO exists, these files are often potentially harmful malware or incomplete fan demos. Better Ways to Play Portably
If you want to play Undertale on the go, consider these official alternatives: PlayStation Vita
: This is the closest experience to a PSP. It features official support, exclusive content like the Dog Shrine, and trophy support. Nintendo Switch
: A highly popular portable version that includes an exclusive boss fight against Mad Mew Mew. Steam Deck
: Since Undertale has a native Linux version, it runs perfectly on Valve's handheld.
I can’t help with requests to find or distribute pirated game copies or links to illegally download copyrighted games.
If you’d like, I can instead:
Which of those would you prefer?
The blue light of the monitor bathed the room in a ghostly glow. It was 2:00 AM, and Marcus was deep in the digital trenches of a search engine, typing the query that had haunted him for weeks: "undertale psp iso download top".
It was a contradiction in terms. Everyone knew Undertale was a PC game, released in 2015, long after the PlayStation Portable had breathed its last official breath. The PSP was a relic of the mid-2000s, a handheld for God of War: Ghost of Sparta and Monster Hunter, not for indie RPGs about mercy and determination.
But the internet is a chaotic attic, and Marcus was a rummager. He had heard rumors on obscure forums—a "lost port," a homebrew project, a fan recreation that was so good it felt official. He wanted to play it on the commute to his dead-end job without draining his phone battery.
He scrolled past the obvious fakes. "Free APK Download!"—those were viruses. "Undertale PSP Edition (Fan Game)"—that was just a broken demo from three years ago.
Then, he saw the tenth link. It didn't look like much. Plain text, no flashy thumbnails. Index of /public/roms/psp/iso/undertale_build_final.rar
It was hosted on a file server that looked like it hadn't been touched since the Bush administration. Marcus clicked it. The file was small—only 150MB. Suspiciously small. But the download speed was blazing fast, as if the file wanted to be on his hard drive.
Five minutes later, he transferred the .iso to his modded PSP. He sat on the edge of his bed, the plastic of the handheld creaking in the silence of his apartment. He scrolled through his memory stick list.
Undertale.cso.
He pressed X.
To his surprise, the screen didn't glitch out. The familiar retro " Playstation " logo appeared, but instead of the usual chime, it played a low, distorted hum, like a cassette tape being eaten by a deck.
Then, the title screen appeared.
It looked like Undertale, but wrong. The pixel art was there, but the resolution was squashed, forcing the characters to look stretched and jagged. The "Undertale" logo was crammed into the top corner of the 4:3 screen, leaving a massive black void at the bottom.
But the music—the music was perfect. It was the SNES-style soundfont, but heavily compressed, giving Fallen Down a gritty, lo-fi texture that made Marcus feel a sudden pang of nostalgia for a year he’d never lived in.
He pressed Start. The menu didn't ask him to name the fallen child. It simply displayed a text box in the center of the void.
> A PSP system has been detected. > Determination is low. > Battery Life: 45%. > Proceed?
Marcus blinked. That wasn't in the script. He selected "Yes."
The game began, but not with Flowey. Marcus controlled a pixelated Frisk who fell into the ruins. The controls were stiff. The D-pad was laggy, making the bullet-hell sequences a nightmare. Yet, Marcus was entranced. He fought through the ruins. The Froggits didn't attack; they simply floated in place, their sprites corrupted into glitching squares of green and purple.
He reached Toriel’s house. He walked down the hallway. The game began to stutter. The frame rate dropped to single digits.
Suddenly, the PSP speakers crackled with a sharp static screech. The screen went black. The PSP power LED flickered red, then green, then purple—a color the LED shouldn't have been able to produce.
A text box appeared, filling the entire screen. Real risks :
> SEARCH QUERY: "undertale psp iso download top" > ARCHIVAL COMPLETE. > SUBJECT: MARCUS. > LOCATION: [HOME ADDRESS REDACTED] > DO NOT SAVE.
Marcus felt a cold sweat break out on his neck. He tried to power off the device. The switch did nothing. The text changed.
> You looked for a way to play on the go. > But the game wants to be played on a PC. > You tried to port something that cannot be contained. > Now, you are the port.
The screen flashed white. A sound like a Game Over jingle played, but it was the sound of a UMD drive spinning violently, whirring and clicking, threatening to shatter.
Marcus dropped the PSP onto his carpet. The device sat there, humming loudly. The screen displayed the "Game Over" text, but instead of the "Stay Determined" speech, it read:
> FILE CORRUPTED. > SYSTEM PURGED.
The PSP turned off with a final, definitive click.
Marcus sat in the dark, his heart hammering against his ribs. He stared at the black device on the floor. Slowly, he reached out to pick it up. It was ice cold to the touch. He turned it over and popped the battery cover open.
The battery was gone. In its place was a small, folded piece of paper. He unfolded it with trembling fingers. Inside, written in a font that looked hand-drawn but pixelated, were the words:
There are no shortcuts to the Underground.
Marcus ran to his computer. He opened the folder where he had downloaded the .rar file. It was gone. He checked his browser history. The query "undertale psp iso download top" was there, but the link he clicked was now a dead end, returning a 404 Error.
He never tried to emulate the game again. He bought a legitimate copy on Steam the next day, but every time he heard the track Hopes and Dreams, he could hear, buried deep beneath the melody, the faint, static hiss of a UMD drive spinning in the dark.
was never officially released for the PlayStation Portable (PSP), so there is no official ISO file to download. However, because the PSP has a dedicated modding community, you can play Undertale on the handheld using a fan-made port How to Play Undertale on PSP
Since you cannot simply download a standard ISO, you must use the "Undertale PSP" homebrew project. This is a reconstruction of the game engine designed to run on PSP hardware. Prepare your PSP : Your PSP must be running Custom Firmware (CFW) (e.g., PRO-C or LME) to run homebrew applications. Find the Homebrew Files : Search for the "Undertale PSP" port by Uyjulian
or similar community developers on GitHub or PSP homebrew forums.
Note: These versions often require you to provide your own legal file from the PC version of Undertale to function. Installation Connect your PSP to your computer via USB. Navigate to ms0:/PSP/GAME/ Create a new folder (e.g.,
) and move the homebrew EBOOT.PBP and any required data files into it. : Disconnect the USB, go to the
menu on your PSP, and select Undertale from the Memory Stick. Important Safety & Legal Tips Avoid "ISO" sites
: Websites claiming to host an "Undertale.iso" for PSP are often providing malware or fake files, as the game isn't a disc-based PSP title. Performance
: Because the PSP has limited RAM (32MB/64MB), fan ports may experience slowdowns or missing visual effects compared to the original PC or PS4 versions. Legal Files
: To stay legal and ensure the game actually runs, you should own the game on Steam/PC to extract the necessary assets for the port. for the port or instructions on how to install Custom Firmware on your PSP?
Undertale PSP ISO Download: A Comprehensive Guide
Undertale is a critically acclaimed role-playing game developed by Toby Fox that was initially released for PC in 2015. The game's unique storytelling, memorable characters, and non-traditional gameplay mechanics quickly gained a massive following worldwide. Since its release, fans have been clamoring for an Undertale PSP ISO download, allowing them to play the game on their PlayStation Portable (PSP) consoles.
Is Undertale Available on PSP?
Unfortunately, Undertale was never officially released on the PSP. The game was initially available on PC, and later releases followed on various platforms, including PlayStation 4, Nintendo Switch, and Xbox One. However, there is no official PSP version of the game.
Why Do Fans Want an Undertale PSP ISO Download?
Despite the lack of an official PSP release, fans still seek out an Undertale PSP ISO download for several reasons:
Can You Download Undertale PSP ISO?
While it's understandable that fans want to download Undertale PSP ISO, it's essential to address the risks and consequences associated with doing so.
Alternative Options
Instead of seeking out an Undertale PSP ISO download, fans can consider the following alternatives:
Conclusion
While an Undertale PSP ISO download may seem appealing to some fans, it's crucial to consider the risks and consequences associated with downloading and playing unofficial copies of the game. Instead, fans can opt for official releases on other platforms or explore alternative portable options.
Top 5 FAQs About Undertale PSP ISO Download
By choosing legitimate and safe options, fans can enjoy Undertale while supporting the game's developer and the gaming industry as a whole.
You're interested in downloading the PSP ISO of Undertale, but I must clarify that Undertale is not natively available on the PSP. Undertale is a popular role-playing game developed by Toby Fox, and it was initially released on PC, Mac, Linux, and later on various consoles like PlayStation 4, PlayStation Vita, Nintendo Switch, and Xbox One.
However, if you're looking for a way to play Undertale on a PSP, you might be interested in knowing that there are no official PSP ports of Undertale. The PSP (PlayStation Portable) is a handheld game console that was popular in the 2000s.
That being said, I can offer some insights on the topic:
If you're interested in playing Undertale, I recommend checking out the game's official website or platform stores (e.g., Steam, PlayStation Store, Nintendo eShop) to see if it's available on a device you own or prefer.
Would you like to know more about:
Some users confuse “Undertale PSP ISO” with running PPSSPP—a PSP emulator—on their phone to play other games. That doesn’t help. However, you can play Undertale on your Android or PC using the official version. There’s simply no way to convert Undertale into a PSP-readable format.
Here’s the confusion source: the PS Vita (PSP’s successor) has a vibrant homebrew scene. Developers created an unofficial Undertale PS Vita port using the "EasyRPG" engine. It runs decently.
But for PSP? No. If you truly want "Undertale on a Sony handheld," the PS Vita is your only legitimate hardware path.
Before you hit “download” on any of the top-listed sites, consider these risks:
