Erik D. Demaine & Martin L. Demaine 
Lifetime of Puzzles [PDF ebook] 

Martin Gardner has entertained the world with his puzzles for decades and inspired countless mathematicians and scientists. As he rounds out another decade, his colleagues are paying him tribute with this special collection that contains contributions from some of the most respected puzzlemasters, magicians and mathematicians, including: – John H. Conway – William R. Gosper – Ed Pegg, Jr. – Roger Penrose – Raymond Smullyan – Peter Winkler. And of course there is something from the original puzzlemaster himself, Martin Gardner.