These riddles are given by example. The solver has succeeded when discover the trick and can give examples as well as the riddler.
Low Grade Riddles
These riddles give riddles everywhere a bad name. When someone offers you a riddle, and then gives you these, you are disappointed.
Fun Problems in Number Theory
Number Theory contains a rich set of interesting problems, some suitable for you or I, some entirely unsolvable. This is a selection of my favorites.
With these riddles, the riddler gives an initial prompt, and the solver(s) ask yes-or-no questions to decuce the full circumstances of the situation.