We used to do this in the Conquest forum a bit. Someone would create rules of a participatory forum game and then we just let it roll. This has been inspired by RobbyStark's fricking difficult Stalemate puzzle but also the original Riddle and Puzzle Threads from Core Set.
The rules of this thread are simple:
1. Each user may only have ONE unsolved Challenge at any one time (if you want to pose more, don't make it too hard).
2. When answering a Challenge, simply state the username (or better, quote the original challenge) and then your answer.
3. Anything Thrones related is fine as long as it challenges the visitor to solve a problem.
4. Don't make the challenges too easy or too difficult - the aim is to entertain, not frustrate.
5. Don't worry if your answer ends up wrong (quite often bettered by another solution).
So this could be an open-ended question (e.g. "what is the maximum power you could gain on the turn that you play Valar to clear the table of all characters?") or a specific game situation like a Chess problem or even something more literary such as my opener (I wouldn't pose quizes unless they are cryptic clues because of the interweb and wikis).
Let's see if this is a cultural thing, that the Conquest forum was just more outgoing and willing to participate in silliness whilst Thrones is a lot more po-faced. This could backfire embarrassingly, especially with a Sunday launch, but I might as well try (and see if this picks up on Monday when work restarts).
Sparrowhawk's Challenge #1
(in the style of children's riddles)
My first is in Mountain, but not in The Hound.
My second hides in Pentos, in Storm's End it’s found.
My third shines in Golden, but shuns Company.
My fourth comes from Tyrosh, and not from Yunkai.
My fifth in Valyrian, but not Ghiscari.
The past or the future? So who then am I?
Please post your own Challenge (but note only 1 unsolved Challenge per user so don't make them too hard). I expect most will be actual game related, not nonsense like the above.