Heavy, pounding electronic tracks with a darker edge than earlier entries. Border Break Scramble's arcade OST from 2014 pushes the series sound into grimier territory. "Lost cluster" builds this oppressive, claustrophobic tension, and "Dark Jungle" does exactly what you think but harder.
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"Extreme pirates" has a reckless energy that makes it one of the most memorable tracks in the whole Border Break series. "Sarcophagus" and "Bitumen" sound like they were composed inside an abandoned factory. Cold, industrial, relentless.
Then it closes on "Overjoyed," which feels almost sarcastic after all that heaviness. Like winning a war and laughing about it. If you want the Border Break entry that goes the hardest, Scramble's your pick.