Crisp Game Boy chiptunes that punch absurdly far above their hardware limitations. Castlevania II: Belmont's Revenge came out in 1991 and somehow squeezed this much atmosphere out of four sound channels. "New Messiah" for the Glass Castle stage has a melody that burrows into your brain and stays there for days.
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"Praying Hands" on the Cloud Castle stage floats with this eerie grace that shouldn't be possible on a Game Boy. "Original Sin" kicks in for Castle Dracula and the intensity just ratchets up perfectly. The whole soundtrack moves between moody and aggressive with zero wasted notes.
Probably the best Game Boy soundtrack in the entire Castlevania series, which is saying something. If you think old portable hardware couldn't deliver real music, four channels would like a word.