Crunchy FM synth ripping through your speakers. Hiouden II on the PC-98 goes hard with that OPNA sound chip, and the whole soundtrack comes in both OPNA and OPN versions so you get two flavors of the same intensity. The opening demo track sets the tone with those sharp, metallic tones the PC-98 did so well.
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Boss 1 is relentless, all rapid arpeggios and driving bass. Then the stage themes keep shifting mood as you push through twenty stages of escalating pressure. What kills me is how much personality they squeezed out of that hardware.
Every stage theme feels distinct even within the same chip limitations. The ending tracks actually breathe a little. If you are into FM synthesis and retro Japanese PC gaming, this is exactly what you want on repeat.