1: Chakan: The Legendary Man (Genesis). You only have one chance to kill the final boss, and if you failed, then it was game over.
2: Call of Duty: World at War. Playing Heart of the Reich on veteran is impossible. If the ultra-accurate AI didn't kill you if you even so much as stuck a pixel out of cover (oh, they know if you peek from cover, even if their back is turned), then the cloud over your head that showers grenades with 1-second fuses will do the trick. Even worse, the enemies don't stop respawning, as if there's an army of clones making another army of clones that only carry a sack of grenades and bullets that only seem to target the player.
3: Call of Duty 4. No Fighting in the War Room. I hate timed missions, and to make matters worse, any intersection I came across had at least two insanely accurate soldiers on all sides, to ensure buttrape if you go too fast or slow. Oh, and enemies respawned until you got past a certain area.
4. Bullet Witch... on Hell difficulty. Insane accuracy, speed, defense, and power, all rolled up in an army of zombie soldiers on [insert choice of pain-reducing narcotic].
5. Crash Bandicoot 1. I could not, for the life of me, get past the Road to Nowhere. Oh, and I hated Ripper Roo.
6. Halo 3. I hated most of Legendary mode, but with enough persistence, I got through it. Oh, I hated the type of Flood that could scale walls and turn into sentry guns, then something that resembles a spider, then something that could kill in a single hit.
