There are several annoyingly hard levels in
Retro Uprising - Arcade - Kid Chameleon - Highscores
Hills of the Warrior I <-- A wall of instant death spikes chase you through the level. You mess up for more than a couple seconds and runs over you.
The Pinnacle <-- You have to climb a mountain of rubber blocks that require perfect landings are you bounce in the wrong direction. You make a single mistake and you fall to the bottom to start over.