Chess.
Riddlers, this next ones not a riddle but a poem about a Riddler, and since this is 'The Riddlers Book', I think it's worth having a look.
YOU ARE READING
The Riddler's Book
RandomRiddle to your hearts content with a poem or two chucked in for the hell of it, but mainly riddles.
Answer 10
Chess.
Riddlers, this next ones not a riddle but a poem about a Riddler, and since this is 'The Riddlers Book', I think it's worth having a look.