If you were a kid with a CD burner and questionable ringtones somewhere around 1999, "The Riddle" by Gigi D'Agostino is permanently soldered into your hippocampus. You didn't choose it. It chose you, somewhere between a school disco and a Nokia 3310.
So here's that exact Eurodance earworm arranged for solo guitar — the whistle hook, the bounce, the nostalgia — squeezed onto six strings in about 53 seconds. No boat required (that was a different anthem).
How arranging The Riddle for guitar actually works
Here's the secret nobody tells you at the club: The Riddle lives in F# minor, and that whistle hook is basically a stepwise little melody that never strays far from home. Once you know the key, the whole thing stops being a mystery — underneath, it's just F#m, E, A and B taking turns, which is exactly why it loops forever without your brain getting bored.
To play it solo the trick is chord-melody: keep the famous melody up on the top strings and grab a single bass note per chord underneath, and your ear happily fills in the rest of the synth stack. If you want to hear how that melody-on-top approach works in general, I nerd out about it over in MelodyChords / ChordMelody / Fingerstyle — and if you're wondering why F# minor sounds so danceable-but-a-little-sad, that's just the minor key doing its job.
Eurodance masterpiece, or three chords wearing glow sticks? Yes. If you want the tabs and the backing track so you can loop it until your flatmates emigrate, they're on my Patreon.