Here are 3 short examples of late Mozart.
Firstly the unusual Adagio for Glasharmonika KV 617a, a very subtle but harmonically highly interesting work, which works also fabulously on the piano.
Then the complex Fantasy in f KV 608 for mechanical clock, here in a 2 versions: one for for pedal piano and organ. Mozart’s increasing fascination with counterpoint is very audible here, it sounds sometimes like Bach could have composed it.
And finally the Kleine Gigue KV 574, a devlishly complicated little work.