This was a really hard one, but HOTA won out for me in the end. Kaizo Possible was about execution and not so much knowledge of how the game works, and HOTA is a mix of both. There is an incredible amount of obscure tech that's really only tailored to veterans who have extensive knowledge of this type of thing, and if one does it's an amazing adventure. I personally loved the hack and it had some crazy puzzles and challenges, making it the most challenging for me without feeling too frustrating.
- Sapphron

HOTA is definitely something to try out for a different type of challenge.
- MetroidMst