Phaethon

One runtime for the Jak games.

An accuracy-first kernel for all four Jak games. Each runs from your own disc as the PlayStation 2 ran it, only faster.

The four cores

The Jak games on PC, faithful to the disc.

See the roadmap

Jak and Daxter

The Precursor Legacy2001 · Playable535 source files in the treeSCUS-97124SCES-50361NTSC-U · PAL

One seamless world with no loading screens, and Precursor orbs in every corner of it.

Jak II

Haven City2003 · Playable847 source files in the treeSCUS-97265SCES-51608NTSC-U · PAL

Haven City, dark eco, and a much sharper edge than the first game.

Jak 3

The Wasteland2004 · Playable1040 source files in the treeSCUS-97330SCUS-97516SCES-52460NTSC-U · PAL

The Wasteland, light eco, and the end of the trilogy.

Jak X

Combat Racing2005 · Playable780 source files in the treeSCUS-97429NTSC-U

Combat racing across the trilogy's world, which OpenGOAL never ported.

How it works

Your disc in, your game out.

The launcher installs the runtime, imports each game from your own disc and keeps everything up to date. Phaethon ships no game data.

Install the launcher

Run the installer. A short setup wizard asks where the runtime and your games should live, and can install the runtime right away.

Import your own disc

Point a game at your disc image. The launcher checks the disc's serial, then extracts, decompiles and compiles the game.

Play

Every game starts retail-faithful. The enhancements are individual toggles in the game's options and in the launcher.

system requirements · windows 10 or 11 · a gpu with vulkan 1.3 · it would probably run on a potato

Built to the frame.

Phaethon is written from the games themselves. Each system is decompiled, compared with a PlayStation 2 capture and landed only when the two agree, frame for frame. The details are the work.

Phaethon

Built with AI in the loop. Phaethon uses AI assistance for speed and accuracy, and holds it to the same bar as every other contribution: every change is read, tested and checked against the console before it lands.

develop 539d7618 CI green v0.2.1 Nov 12, 2026

Phaethon is an unofficial fan project. It is not affiliated with, endorsed by or associated with Sony Interactive Entertainment, Naughty Dog or the OpenGOAL project. Jak and Daxter is a trademark of Sony Interactive Entertainment. You need your own copy of each game. Icons from Lucide, ISC; JetBrains Mono under the SIL Open Font License.

Under construction

This site is still being built.

Nothing links to playphaethon.com yet, so you have found it before it is ready. Some of what it says may be wrong, out of date or attributed to the wrong source. Treat it as a work in progress until this notice is gone.