A big part of gaming culture went missing a while ago. Back in the '90s, professional, studio-developed games were only one part of the bigger picture. Thanks to lower development cost and the proliferation of capable home gaming computers like the Commodore 64 and Amiga, anyone with a bit of knowledge could get a game made and distributed, amongst their mates at least. The homebrew scene was huge, and top-notch games spewed out of bedrooms worldwide.Some even got picked up by big-name publishers and went stratospheric. See Worms as your example of that.
But as the industry went mega-budget, that sort of thing died down. Thankfully though, it's now beginning to see a resurgence as the internet provides us with all manner of simple development tools and unlimited distribution. Thus, gamers are making games again, and a lot of them are taking their favourite franchises as inspiration. Completely unlicensed and unendorsed by the people in charge, remakes and new sequels are popping up all over the 'net, and while a lot of them are obviously as fun as herpes, some of them are excellent. These are some of those excellent ones, Games Radar's current favourite pick of the internet's guerilla games.