For me MM was the hardest Zelda. I remember when I was trying to cross the Deku Palace. At the time I was only around 8 or 9. And I was like, "♥♥♥♥. I fell again." And then there was Gyorg, who was the HARDEST video game boss I've EVER FOUGHT. And I've fought the Boost Guardian from Metroid Prime 2: Echoes on GC.
TP was way too easy. I absolutely never died on it. The hardest puzzle for me was that wstupid statue puzzle before the Master Sword. It took me well over half an hour.