As true as the sky is blue, the grass is green, and the earth is round (it is, before you write in), gamers are, when it comes down to it, a load of bastards. You can spend thousands of hours carefully crafting an intricate digital playground full of thousands of creative possibilities, only for single-minded padsters worrying over such dangerous terms as 'maximum efficiency' to come in and completely break it. If it's possible to overcome all of a title's challenges with a single highly-effective, albeit tedious, method, then you can guarantee players will forego everything else, and do just that.
If this spills over into multiplayer, you've got an argument on your hands, between those who consider themselves to be 'playing the game properly', and those who just want to win at all costs. It's for this reason the word 'Oddjob' is mud amongst frustrated Goldeneye fans, and why developers must work tirelessly to get the balance of their games just right.
They don't always hit peak equilibrium, however. These exploits are cheaper than a hot dog with no mustard, but we used them anyway. Because we could.
10. Psychic Type (Pokémon Red/Blue)
The first generation of Pokémon, whilst vehemently espoused as the series' only true canon by nostalgia-riddled 30-somethings, is absolutely swarming with bugs - and we're not talking Weedles and Caterpies.
Eldritch glitch pOck3t mOnster5 roam the east coast of Cinnabar Island, and nefarious trainers belonging to the 'Dr. Frankenstein' class are able to create hideous chimeric Pokémon, half Charizard, half Magikarp (Charikarp, if you will). But even without sticking a screwdriver in the cartridge slot, there are major programming oversights which make Pokémon more like Brokémon.
The Psychic type, for example, plum takes the piss. Though theoretically weak to both Bug and Ghost, not a single move in the former category is powerful enough to make a dent, and the only examples in the entire game of the latter are all part-Poison - itself a wet flannel in the face of Gen. 1's range of temple-rubbers.
A varied, balanced team is recommended, but it's entirely unnecessary when you can just raze through every single gym and the Elite 4 with the power of yours - or your Pokémon's - mind alone.