Remixed battle themes slamming into goofy minigame music. Fate/hollow ataraxia's bonus soundtrack for Windows is the most chaotic Fate album you'll find. "wars (meteor blaze mix)" and "outbreak (red hot tornado mix)" take familiar tracks and crank them into overdrive.
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Then "Tiger The Movie" exists and it sounds exactly like what Taiga would commission for her own action film. "Mushroom Trip" is. Well. It's called Mushroom Trip. The Hanafuda card game section has its own set of tracks, "Now Troubling (Koi-Koi)" being the standout for pure silly tension.
"Die Lorelei" shifts the mood completely into something haunting and strange. If you want proof that mid-2000s Fate had zero fear of tonal whiplash, just hit play on this thing.