Genius redditor created a multiplayer 2d game, where everybody edits the world
reddit.com
reddit.com
As an aside, there was an awesome interview with Tim Sweeney last year that's worth the read, I think it made HN at the time - http://www.gamasutra.com/view/feature/4035/from_the_past_to_...
Epilogue: I made a friend then I got disconnected. We were building a fort. :(
It's amazing to see social interactions popping up with such limited communication. The lack of a chat feature is actually good imo, makes the whole experience more friendly and imprevisible.
The idea of user-created content in games is much older, player-edited worlds go all the way back to MUDs, MUCKs, MOOs, etc.
He's also very open with the community and readily takes suggestions and implements them. At one point he'd released the map format (based on his custom NBT format) so community developers could create tools of their own. I'm sure the format has changed drastically by now, though, since he changed the levels from a fixed size (64x64x32 blocks or variations of that) to an unlimited world size. I can imagine multi-player servers for this springing up and having huge cities being built by players.
Strangely, I like the "map" function better than the actual game.
Looks like it'll have a great future, but it's not too entertaining right now.
Just sayin'
So I was sort of playing King of the Hill for a while.
Then I decided to start exploring the world without movement keys, ie only adding movement arrows, pits, and slow-down dots. I got pretty good at it. Every now and then I would land on someone and bring them along for the ride, until they hit a key. Sometimes we would land on some interesting loops other people made.
I was just trying to keep my speed up. That was kind of like Rollercoaster Tycoon.