The DS speakers had no right pushing out tension like this. Trauma Center: Under the Knife was scored by Shoji Meguro, Kenichi Tsuchiya, and Kenichi Kikkawa, and they squeezed real anxiety out of that tiny hardware. "GUILT Operation" is the one that gets your pulse going, this relentless driving rhythm while you're trying to extract alien parasites with a stylus.
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"Dangerous Operation" layers urgency on top of urgency until you can barely breathe. Then "Event- Sadness" pulls you out of the adrenaline completely. Just quiet devastation. Tsuchiya actually composed some of his tracks directly on DS hardware, which explains why they fit the system so naturally.
If you survived those GUILT operations, you already know this soundtrack earned every note.