4. The Dam - Teenage Mutant Ninja Turtles (NES)
http://www.youtube.com/watch?v=DqfRus5ePmI Nobody likes underwater levels. By definition, they suck. The ones that embrace realism, (like, say, Sonic of the Hedgehog, which forced you to collect air bubbles or drown) are nerve-jangling horrors, but even the ones that let you breathe indefinitely are nightmarish. There's just something about an underwater level. A sense of claustrophobia and the feeling you just don't belong. Think you've played the worst kind of underwater level? Think again. Let us introduce you to "The Dam," an underwater level courtesy of Teenage Mutant Ninja Turtles for the NES. This level - presumably programmed by somebody going through a messy divorce - required you to swim through a tunnel, dodging electrified tentacle things, and defusing bombs. Oh, and you're also on a timer, just 'cause. The fact that you had to accomplish such a task in the first place is questionable, but making it so that you have to do it under the wrath of a ticking clock was just nasty. Scientists currently believe that "The Dam" was responsible for at least 9 out of 10 mental breakdowns that occurred in 1989.