You should learn an extreme sport if 'challenge' and 'technique' are all that matter!! A common trend on this forum would be the following:
"Hey everyone, I'm an advanced pianist, but these pieces are WaY tOo EASY!:
-Campanella
-Fantaisie Impromptu
-Moonlight 3rd Movement
-Winterwind
-etc
Please suggest something!"
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Every single post like that comes from people who have only been playing a few years, like to play fast, but have a horrible tone (check the history from the audition room...). I joined the forum in 2004 when I was in grade 8 or 9, and I was totally like that. It's shocking how much repertoire is out there, and when you get past playing pieces for the sheer thrill of playing fast, you realize how much there is to piano music.
I'll suggest some piece SIMILAR to what you are looking for, but I seriously doubt you are actually able to play pieces at the level of La Campanella:
-Liszt 'Preludio' from the 12 Etudes
-Chabrier 'Scherzo Valse'
-Ravel 'Vallée des Cloches'
-Debussy 'le Vent dans la Plaine', or 'Jardins sous la Pluie', or the Prélude from 'pour le piano'
-Chopin 'Nocturne Op. 9 #1', 'Etude Op 10 #5, or 25 #1 or 2', or 'Preludes Op. 28 in C major, G major, C# minor, B major, F major, G minor'
-Kabalevsky, Any of the Preludes
-Shostakovich, Preludes and Fugues (they are AWESOME)
-Prokofiev, any of the Visons Fugitives, or Suggestion Diabolique
-Tchaikovsky, Dumka, or any of the Seasons
-Movement of a Beethoven Piano Concerto???
...Look at those pieces. If you are actually playing the rep you listed, then you are probably able to learn any of these in a few hours (except maybe the Chopin Etudes and some of the Debussy). If you are comfortable with the level you are at, try approaching the repertoire from a different angle: broaden your horizons, think laterally rather than vertically. Try finding other composers at the same level as you are rather than HARDER pieces by Chopin/Liszt.