The_root_of_all_evil said:
Forbidden Forest on the C64. Ignoring the music, it is perhaps the most frustrating game ever.
Quick Hint: NOTHING in this game is skippable. And the ear-shattering beeps are normal. Limited Ammo. You can't move while drawing. And you only have three lives, apart from the final boss, who if you miss, you go back to the beginning.
Sadly, one of my favourite games of all time

I still play it to this day. Thankfully emulation means I don't have to sit through the 30 minute loading time any more.
I've played it so much that I can kill the final boss without seeing it, and it can only be killed by hitting it between the eyes.
Forbidden Forest 2 however was EVIL.
EDIT: If ever a game screamed for motion controls with that whole archery mechanic it is this one.