I'll start then
I like to put riddles in as door passwords and questions for guards to ask, of course. Riddle contests are another favorite that's been under-used lately. Until next week anyway
I've got a d20 Modern game in the works.
I've got one riddle that's been my favorite. Interestingly it's got a fifty-fifty ratio for correct guesses.
In every land am I native yet few natives can have me,
Tyrants place hindrances in an attempt to stab me,
One cannot win or draw until one knows to lose,
Whether or not I'm felt by all is up to all to choose.
This one hasn't been notoriously difficult. Either people knew right away or they didn't, usually. Few puzzled it out. Flavor has been the best with that one. The leader of a slave rebellion was the first to pose this one.
That one has gone over well and not well. It's often anticlimactic when people get them right away and usually that one has been gotten in that manner.