So here's the idea: First someone posts something that is somehow obscured (that is purposefully vague), eg by using ROT13. Ideally use something like a movie quote or common idiom as the text to obscure, so that someone can know if they got it right.
You do not
have to post another code if you guess the previous one. Too often I've held back from posting in a forum game because I didn't have the second part to complete the chain.
If a code is unsolved for 48 hours (subject to change with experimentation) then it is declared impossible and whoever posted the code should post the solution, and anyone may post a new code.
So, it's a loop of code post, solution to previous code post, code post, solution post, etc. Someone who posts a solution may also post a code if they're sure they've gotten it right.
I'll start with something easy (I think?):
super callus fridge smell itch stick expell I Allah doe shoes