Falcom brought Zwei!! to PSP in 2008 and rearranged basically the entire soundtrack in the process. Same bones as the 2001 original but everything sounds fuller and more refined on the portable hardware. "Kayapa Forest" keeps that bouncy personality but the instrument samples are noticeably richer.
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"Fight!! -Attack of Pokkle-" still goes hard, maybe even harder with the updated mix. "Floating Continent Arges -Main Theme-" gets this warmer treatment that really suits the PSP's sound capabilities. Colbet's theme still has that ridiculous cat subtitle and I respect that they kept it.
The dungeon tracks especially benefit from the rework. If you played the PC original, hearing these arrangements side by side is genuinely fun, and if you haven't, this is the better-sounding version.