Huge indeed, this book from the "dean of American puzzlers" covers puzzles of many different types--Combinatorial, geometric, algorithmic, wordplay, and physics. Some brain teasers thrown in just to keep it quizzical! Fun and challenging.
The questions range from complex combinatoric/factorial calculations to logic questions like:
On a sultry July night in Omaha, it was raining at midnight. Is it possible that 72 hours later the weather in Omaha was sunny? Think about it.