Sometimes a two-track browser game soundtrack just slaps and you can't explain why. Tanked Up is a 2006 online game that shipped with exactly a Main theme and a Menu theme and honestly both of them go. The Main track has this scrappy, energetic loop that keeps the action moving without wearing out its welcome.
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Menu sits you down with something lighter, just enough to fill the space between rounds. Two tracks, no filler, zero fat. That's it, that's the whole OST. If you ever lost an afternoon to flash-era browser games, you know this kind of compact soundtrack energy was everywhere and sometimes it just worked perfectly.