E.T. for the Atari: [censored]
Seriously though: Disney's Dinosaurs: Illogical
There was this part where there was a wall of fire blocking your way. How were you supposed to get past it? After trying everything I could think of, I decided to put an end to my misery and run straight at the wall of fire. It did put an end to my misery, but not in the way I was planning: The fire disappeared when I ran at it. Apparently, you were supposed to run straight into the fire. No instructions were given to clarify this; you were expected to do what both common sense, instinct, intelligence and tradition told you not to do.