I'm referring specifically to this question: for an Ingress player it's clear what it's being asked, and I've edited it to refer to the "passcodes" game-specific term, instead of the generic "codes". For someone not playing the game the question may not be clear at all, could this be a rightful closing reason? It can be further edited to explain in detail what passcodes are, but from a player standpoint it is redundant: they already know what passcodes are, and if they are on this question they don't need it to be explained.
I don't see any particular reason why a question should have to go out of its way to make itself understandable to someone not familiar with the game or else face closure. If that were the case, every League of Legends question would need to be closed.
What's important is that the people who have the game understand it, and the people who could answer the question understand it. Now, if you want to take the extra time with your question to make them understandable to people unfamiliar with the game, great! Taking that kind of care with our content can really set this place apart from forums or Yahoo! Answers. But in my mind, that should be upvote/downvote criteria, not close vote criteria.
That said, we're all human here and we make mistakes. You may just need to call attention to questions when they are incorrectly closed in this way. People unfamiliar with the game probably truly believe the question is unclear. Hopefully when the situation is explained to them, they won't argue against the question being reopened. In this case, it looks like the question has already indeed been reopened.
The question doesn't need to be understandable by everyone, but it should look like it's understandable to those who play the game. If not, there's the chance it gets incorrectly closed as unclear, which is what happened here. It's a lot better to explain that extra little detail before it gets closed than it is afterwards.
I'm not saying looking like understandable is a requirement. I'm saying it's better than the alternative.
Isn't that the reason why the "Skip" button exists in the review queue? If I'm not familiar with the game I prefer to leave the review to people that know what we're talking about. – Kappei
It would be great, if this was the case, but there aren't 5 active people for every game we have questions about, and that's not a realistic goal either. That said, I would have skipped that particular question had I seen it in review.
No, because otherwise questions about in-depth game mechanics would literally have to explain the whole game mechanics to be understandable. Even questions which don't actually go that deep would read like this:
Where in Final Fantasy VI (an RPG game by SquareSoft in 1993) can I obtain the Magicite (Magicites are like the "souls" of so-called espers which you usually get when you defeat them in combat. You can equip them on your characters, from which you have a lot, but only four at a time at most. When you do so they can learn their magic which you can use in combat. Combat is the most important element of the game, and having lots of spells makes the game a lot easier) of the esper Raiden (which is, as I heard, not that easy to find, in contrary to most other espers which you can't miss because they are at fixed points of the story. But this one is hidden and can be missed. It is one of the most powerful ones. It gives you the "Quick" spell which is really useful because when you cast it your characters can act twice as often in combat, so many players want to have it. Also, it's interesting for completionists who want to make sure that they get everything there is to find in the game).