Well, except that it's pretty free-form and casual, since it's really just a group-motivation-for-personal-challenge thing; "IntRenaiMo" is part of the same thing, where the challenge is instead to finish off an already-started project in the same month. Since there's no competition or prizes or anything any rules we have are only enforced by your own pride.
Specifically, NaNoRenO is run over the month of March - hence seeing entries appearing now - and IIRC this was the fourth year it's been run.
(There's a whole list of details up on Rio's site
, but really, none of them are 'enforced' as such; no-one's turning around and telling people who write KNs they don't count 'cause they don't have two separate endings, for example.
Yeah, that's true. NaNoRenO gives a lot more slack then most, and it really is a good way of getting people to make a game. Rather then having them feel like they will need to put months of effort in, sometimes people like to hear "Well, just do it for a month and see what you can do!". It gets more people involved then normally would.
I don't know how many follow the rules, but most of them aren't too big a deal anyway :/
Some site said it must have a specific amount of words and must be about love. Is it true?
As Jake said, the rules aren't really enforced so no one is going to say "this game doesn't count, there was no love in it!" For the number of words, I don't think NaNoRenO does something like that...I know other forms of it do, but since this version requires everything from writing to programming it cuts in on the time you might be able to write on it (unless your a part of a team).