Puzzles and riddles can tie your brain in knots, but that's really a great way to exercise it! These puzzles include both traditional riddles together with "lateral thinking" problems. While riddles ask you to twist language, lateral thinking problems require you to twist your thinking a bit to concoct a story or scenario that will make the problem work (the way a riddle works), but makes the least number of assumptions to do that.
There is no scoring here: You know whether your solution was close or not! But don't just flip through the riddles and problems looking at the answers. Make yourself try hard to solve them -- remember, you want to build up that brain of yours!.