I love puzzles like the ones that Click and Clack showcase on Car Talk (NPR). The Sunday Puzzle (http://www.npr.org/series/4473090/sunday-puzzle) by Will Shortz is also another source of challenging word puzzles. Games Magazine and Martin Gardner's columns in Scientific American are/were also fantastic reads for games and puzzles.
What other sources of word/math/logic puzzles are out there?
What other sources of word/math/logic puzzles are out there?