Game compatibility (2026-06-19)

A snapshot of how each tested game runs.

Compatibility ratings

From best to worst:

Rating	Meaning
Perfect	Runs with no noticeable problems.
Playable	Playable start to finish, only minor issues.
Ingame	Reaches gameplay but with significant glitches or low speed.
Menu/Intro	Reaches menus or intro videos, not gameplay.
Doesn't Boot	Crashes at boot or shows nothing.

Games

Game	Game ID	Compatibility	Notes
Metal Slug XX	ULUS10495	Playable	Renders correctly.
Puzzle Bobble	ULJM05011	Playable	Full speed with sound.
Burnout Legends	ULES00125	Ingame	Graphical glitches.
Cladun	NPEH00084	Ingame	Low FPS in some scenes. No sound.
Duke3D	homebrew	Ingame	Boots and works without issues, but low FPS.
Gran Turismo	UCES01245	Ingame	Graphical glitches and low FPS.
Puyo Puyo	ULJM05058	Ingame	Menus, logo, and text render.
Ridge Racer	ULUS10001	Ingame	3D models render in-race.
Toy Story 3	ULES01406	Ingame	Visual glitches and a save-game issue.
Dragon Ball Z Shin Budokai	ULES00309	Menu/Intro
God of War: Ghost of Sparta	UCUS98737	Menu/Intro	Blank screen after the intro; never reaches the menu.
Wipeout Pure	UCUS98612	Menu/Intro	Intro videos play (WebCodecs H.264) and menus render.
Grand Theft Auto: Vice City Stories	ULUS10160	Doesn't Boot
LEGO Batman: The Videogame	ULES01151	Doesn't Boot
LittleBigPlanet	UCES01264	Doesn't Boot	Fails with "pthread API call from non-pthread thread"; our threads are not registered as SCE pthreads.
Space Invaders	ULES01078	Doesn't Boot	Black screen. Event-flag bits are never set, then a CPU spin loop. Likely an intro-video wait.

Known issues

Rendering

• Deferred GPU-accuracy gaps, each with a reason in the code: 16-bit color replication, WebGL doubled-alpha blend, FRAMEBUFWIDTH high bits, morph weights, WebGL CLUT hashing.

Performance

• God of War is slow. WebGL draws are already batched by render state, so the cost that's left is the MIPS interpreter and GE vertex processing.

Audio

• SAS (sceSas) synthesizes only VAG and PCM voices (plus pitch, L/R volume, ADSR). Not done: ATRAC3 voices, noise/triangle/pulse waveform voices, and the reverb/effect-send path (dry mixing only).
• No MPEG or SAS reverb. MPEG cutscene audio via sceMpegAtracDecode is decoded and played.

Planned work

1. sceMpeg intro-video handling for the games that still block on it.
2. Speed up God of War: the MIPS interpreter and GE vertex processing are the slow parts now.
3. Revive the GE Web Worker to move GE work off the main thread, ideally over a SharedArrayBuffer command ring.
4. Utility dialog status numbering for msgdialog, netconf, and osk.