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Frequently Asked Questions

General Questions

How do I play it?


You will need your own legitimately obtained copy of the original game. The Jak games are not rare and can be found used for very affordable prices at a variety of second-hand and online stores.

Example Jak and Daxter listing (THIS IS NOT AN ENDORSEMENT).

We encourage you to use our Launcher which simplifies the installation and updating process. You can find a link to get this from the homepage at:

Alternatively, you can use the latest release from our GitHub repo and provide the path to your ISO like so - ./extractor[.exe] <path-to-iso>. Once this completes, you should be able to run gk[.exe] to start the game.

We support all retail versions of the original Jak and Daxter. For more details on how your version of the games matter, see this page. There is no planned support for early builds and demos.

What are the minimum requirements?

These are the minimum requirements for the project at the time of writing:

  • An operating system that we support
    • Windows 10 / 11
    • A Linux distro that is still atleast in LTS (we build with Ubuntu 20.04)
    • An Intel Mac running atleast BigSur
  • x86-64 CPU with AVX support.
    • Most, if not all, 64-bit CPUs should work. OpenGOAL has a very small CPU footprint, so most modern CPUs will run the game fine.
  • Graphics card that supports OpenGL 4.3 (or OpenGL 4.1 in the case of macOS).
    • If you have an AMD Radeon card, updating your AMD drivers to at least version 22.7.1 is recommended. Older driver versions or other AMD cards will be running at a disadvantage.
  • At least 2 GiB of available RAM for the game is recommended.
  • You might experience slower loads with a hard drive compared to an SSD.

Will AVX always be required?

At this time, yes.

AVX instructions are used for basically all vector math computations used in rendering, collision detection, and other game logic.

Where can I donate?

For several reasons, we are not accepting financial donations of any kind.

Why was this project started?

First and foremost, for fun and the challenge. We are primarily interested in learning how the original games were made, and understanding the technology behind them. The end result of a working PC port that can potentially support mod and such is very motivating and exciting -- but ultimately secondary.


My antivirus claims it's a virus, what gives?

This is caused by a false-positive detection, which we can do nothing about. If you have any doubts, our code and release process is entirely open-source and can be audited.

How finished is the project?

The first game is at a stage where it is mostly feature complete and bug free on the default settings. Jak II is in very early stages, come back later!

When is Jak II / Jak 3 / Jak X?

Please remember that we do this work for free, in our spare time, when we feel like it. There are no rigid timelines that we make for ourselves, things will be done when they are done.

  • Jak and Daxter is mostly finished, bug fixes and improvements will continue to be added overtime.
  • Jak II is in very early stages, do not hold your breath on this being complete within atleast a year.
  • Jak 3 will probably be worked on after Jak II is "complete."
  • We are unsure if we will work on Jak X at this time.

Will you decompile Daxter or The Lost Frontier?

No, these games run on completely different engines and were not made by Naughty Dog.

Will you decompile Ratchet & Clank? Don't they share the same engine?

No. Ratchet & Clank does not use Naughty Dog's engine and was not written in GOAL, it was developed by a completely different team of people. As stated in staff roll for the Ratchet & Clank games, only the background renderers use Naughty Dog technology. Our work is not transferrable to that series.

Will you decompile [insert non-Jak game here]?

No, we are no where near done with Jak yet, and other than experience not much is transferable from this project to others. The Jak games present a very unique set of challenges that we have solved that other games do not -- similarly other games pose entirely new sets of challenges.

Most importantly, we are motivated on working on Jak, not other games. Those other games likely already have small niche communities plugging away at things in the background just like we were.

Is there support for raytracing?

Implementing raytracing would require a very massive art overhaul which is far outside the scope of this project.

Game Info

Does the game have differences? I don't remember these options!

We have added a plethora of options to the game settings (and removed some that didn't make sense) so that you can have a more up to date experience, or a more PS2-like experience if you decide. It is up to you! There are also a bunch of extra goodies and added secrets to find out. We are aiming to keep the core gameplay (controls, physics, behaviors, etc.) identical however, so if you find any issues or differences with this then do not hesitate to tell us about it.

Will there be bug fixes to the game?

The original game had a few issues of varying severity - from progress softlocks to crashing - that we are aiming to patch. The complexity of these issues is varying (if they were simple to reproduce and fix, Naughty Dog likely would have done it), but so far we have fixed more than a couple of issues that could crash the game.

Will there be mod support?

In the future yes! We intend to make it as easy as we can to make your own code or import graphics for the game.


I am getting "illegal operation"/"illegal instruction" errors when running the game or tools.

Make sure your CPU supports AVX. If it does, please contact us in the support channel of the discord server and we can try to help.

The game is really slow.

Your GPU might be too weak. Some of our rendering code is a bit inefficient and can still be improved, but you should expect significantly better performance than for example running via an emulator. Therefore, things might get better overtime -- or your hardware is just plain too limiting.

The game crashed!!

Curses! Contact us in the help channel on the discord server and tell us about it! Post the log files as well. These are located in the data/log folder of the release (if you are using the Launcher, there is a button on the settings tab that takes you to the folder containing the data folder).

Make sure you tell us exactly how the crash happened and what settings you were using.

My controller doesn't work!

Our controller handling does need some work, but generally speaking any controller defined in this database should be supported You can try the following until support improves:

  • Make sure you only have 1 controller plugged in at a time to ensure that one is used
  • Try leveraging Steam to get the controller recognized
  • If your controller isn't in the DB above, you should follow the steps there to make a mapping for your controller

I am having some other issue or found a bug with the game/tools.

First, scroll through our issues page to make sure that your issue hasn't been reported already. If it hasn't, feel free to open up a new issue, or report it to us directly. Make sure you provide reproduction steps! We can't always guess why things go wrong.

Technical Questions

How is this project possible?

Naughty Dog created a custom programming language called GOAL, along with a compiler for it. GOAL makes up 98% of all the code in Jak and Daxter, and the GOAL compiler does not have the same amount of optimizations as C or C++ compilers have, which means that the compiler often times left specific instructions that denote some specific kind of control flow, which lets us piece back the original structure of the code accurately for about 99% of the functions in the game. Nearly every type in GOAL also has an autogenerated debug inspect method, which prints all of a type's fields by default. These inspect methods can tell us what fields were in the type, at what offset, and what their type was.

I'm a developer, how can I help?

Our project moves very fast so it's hard to give an answer here that will remain true for weeks let alone months.

Some recommended steps are:

  • Consult our GitHub README and get the project setup
  • Look through our documentation that we try to update when we get a chance
  • Look through our issue board on the github repository and see if you feel comfortable tackling a problem

Aside from the OpenGOAL source code for the games, our codebase is almost entirely C++ with the exception of some throwaway scripts written in Python or what have you. Of course you will eventually have to understand OpenGOAL, our flavour of the Naughty Dog language, as the game is by-and-large not rewritten in C++.

Will you support ARM platforms?

No, and the current core-development team has no one interested in undertaking the work to port our code to work on ARM platforms.