59 levels to play before you die: S - Z

StarCraft (PC) | New Gettysburg
The second-to-last mission in the original StarCraft's Terran campaign gives you a strange directive: while you're supposed to wipe out every trace of the hyper-advanced Protoss aliens, you're specifically ordered not to bother the swarming, bestial Zerg situated right near your base. What happens once you carry out those orders affected us in a way we never knew a real-time strategy game could. Once the last Protoss is dead, a massive wave of Zerg sweeps across the screen, obliterating everything you've built in a matter of seconds. Making matters worse, one of the main characters - Sarah Kerrigan, a psychic Ghost operative you've gotten to know over the last nine missions - gets caught in the destruction and is apparently devoured by the Zerg horde. And it only happened because your boss wanted to weed out anyone who might be a threat to his power.

Of course, StarCraft fans know what really happened to Kerrigan, and why it's integral to the rest of the game's plot - but that's perhaps a story for another article (or, you know, Wikipedia). In the meantime, though, you can see the crushing horde being stopped in its tracks by one determined player who probably cheated like hell to put all that hardware at his disposal.