Aladdin (Virgin Games)/YMMV


 * That One Level:
 * The level prior to the rug ride, as the cave collapses and Aladdin attempts to escape on foot, will floor new players and put veterans under pressure. Its the first level to introduce the lethal One Hit KO boulders, there are instant-kill pits into lava all over the place (this is also the first place where the environment can really screw you over; the level before it (the cave of wonders) has water functioning as Bottomless Pits but you have to screw up majorly to get hit by them) the roofs of the caves are so low that jumping the bottomless pits within the caves becomes a matter of perfect timing... and to top it off, the last boulder, even if you do manage to outrun it, can often wind up falling on top of you while you are on the carpet!!! And to top it off, the game won't skip this for you like it will the second part of the escape, Rug Ride, if you mess up enough times. The rest of the game is a breeze after you clear that level...
 * The Rug Ride level itself qualifies in the DOS version. You're riding the carpet through a narrow tunnel, while trying to dodge One-Hit Kill boulders. The level slowly becomes faster and faster and faster and faster until you need lightning-fast reflexes. There are no checkpoints and dying will send you back to the beginning of the level. Averted in the Genesis version where you'll automatically skip it after failing enough times.
 * Inside the Lamp, a.k.a the Genie level, isn't tough at all at first. There are no enemies and no way to take damage. But the whole thing is a bunch of Floating Platforms above a massive Bottomless Pit: towards the end of the level, finding solid footing becomes increasingly difficult and you have to persorm quite a lot of pixel-perfect jumps. The most maddening momemt is just before the end of the level: there is a very tiny genie hand platform, some pixels wide, that you have to jump on. Missing it means instant death and redoing several difficult jumps. The hand is also so low that it floats off-camera, and can't be seen unless you crouch.