7. Black Project - San Andreas
https://www.youtube.com/watch?v=FzbTc4a-VMw Y'know what no one has ever said in the history of mankind? "Boy, I'd sure love some stealth sections in my GTA" Not only did you get one of them as you infiltrate a high-end Vinewood mansion, but there's another far deeper into the game that although it rewards you with the jetpack, is all kinds of hell to get there. It's a mission that gets imminently worse thanks to the lack of checkpointing, and one of the many throughout San Andreas that proved Rockstar's idea for how missions should be structured was in desperate need of an overhaul. It literally plays out like a weird Metal Gear clone, asking you to stay out the way of spotlights and silently head-pop guys to win (but no more than two, otherwise instant-failure!), but the real issues come when you delve even further into the restricted underground areas of the factory, making you an even easier target for the guards on patrol.