I was hoping, in the ironical sense, to not have to post a huge essay in a topic started by a huge essay.
-Only 3 submissions; 2 of them are the super short warped runs, but the any% is super long, and has yet to be obsoleted.
-The 100% run everyone wants to see, yet still remains incomplete.
-Every frame of ever second of every minute you must watch tons of memory addresses.
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This.
-Speed increments, but you can;t freeze it above normal like in SMW.
-Acceleration is a bitch.
-The shooting system of eggs is immensely complex. Aiming is tricky, managing eggs is tricky, making them ricochet perfectly is tricky.
-staying at maximum speed is tricky.
-The game is immensely complex. new routes are being found constantly.
-massive rerecording behavior needed; even then, constant redoes are necessary.
Lemme know if you need more. there's still plenty of reasons; I could go on and on.
Starfox 64 doesn't deserve it because a run would have easily been done already if meepers and I weren't so lazy.
I would like to mention that I think this topic sucks ass. The term 'hardest' is about as subjective as entertaining; there is not going to be a universal decision on what game is hardest. Also, I do believe that the site should not be about whining or bragging about how tough a game is to TAS.