Final Fight: Streetwise (PlayStation 2)

Final Fight: Streetwise was a well-intentioned yet ill-designed attempt to restart the Final Fight franchise that was ultimately doomed by executive meddling, which led to Capcom Studio 8 being shut down. And it contains enough cursing to make you think the writers were sailors...

(Note that this version uses the same assets as its Xbox counterpart, so some unused content is present in both.)

Unused Music
PSXData\MUSIC\previews.bin contains the preview clips used in the music shops. The archive contains two preview tracks that are not used:

The first is for Temptation, Pt. 2, performed by Fat Joe. The song is not included in the game, and was either a placeholder, or they simply did not get clearance to use it in the game. You can hear the full song here.

The second one is for Superfun Teenage Girls, performed by Stymie & the Pimp Jones Luv Orchestra. Not only that...

The full song is still on the disc, as SXData\Music\QRSTU\stymie.adx! Judging from the preview track, this song might have been planned to be purchasable at one point, but it's very different from the rest of the game's soundtrack, so it was probably axed because of that. Portions of the song are still used in the roach- and rat-killing minigames.

Speaking of the rat- and roach-killing minigames, the victory and losing themes have an additional 30 seconds of music that is never heard in-game. The victory theme uses portions of Superfun Teenage Girls, while the losing theme uses a bit of library music with a kazoo and a drum.

Leftover Cutscene Audio
PSXData\Cut1Aud\scene005.adx contains a bit of conversation between Kyle and the cashier at the diner that was never used. Here, Kyle asks for info on a "black guy who looks like he means business", which leads to the cashier to question his heterosexuality; in the final game, Kyle has to kill some roaches to get information on Stiff and Weasel. The file is dated August 4, 2005, while the rest of the files are from September to December 2005, so it's from an earlier draft of the story that got cut.

Unused Cutscene Video and Audio
The game renders most of its cutscenes with the in-game engine and plays back all conversation and sound effects from a streamed ADX file, but there's some strange leftovers:

Scene000
The introduction cutscene. The disc has a video version (PSXData\Cut1\Scene000.sfd), but the game ignores it and renders it with the game engine instead.

Scene001, Scene038, Scene048
The game files contain engine-rendered versions of all three cutscenes (PSXData\Cut1\Scene000.saw/adx, PSXData\Cut2\scene038.saw/adx, and PSXData\Cut2\scene048.saw/adx), but the game plays back video files instead.

Unused Videos
The PSXData\Test folder contains two unused files:

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The first, trailer.sfd, is an early E3 promo for the game which contains footage from various stages in development, and very different-sounding Kyle and Cody voice actors.

The second is a duplicate of video2.sfd called video4.sfd. The video is What Drives the Weak, performed by Shadows Fall. Strangely, text inside the game's executable file mentions four bonus FMVs, but only three are available in the bonus section.

Unused Voice Clips
The main sound archive (PSXDATA\SOUND\DIALOG.ADS) contains all gameplay voice clips and sound effects that play during the game. It also contains some early voice clips for Kyle Travers: