Hi all, i've been searching for a great problem books in physics. Right now, i've been solving I.E. Irodov's Problems in general physics, Mir Publishers. Some of the problems are great. Its fun solving it. I want to know, if there are many more such problem books, requiring great skill at problem solving. Can you guys help me out? I love tough problems, the tougher the problems, the more the fun. I've also been looking for good physics texts to supplement the problems. Feynman lectures are classic and I love it. But I am looking for more precise texts with a bit more mathematics. I've been able to get Irodov's Fundamental Laws of Mechanics for the mechanics part. The book is a great asset for honing problem-solving skills. I've Fundamentals of Physics (Resnick,Halliday,Walker), but the concepts are not much clear and some important concepts are missing/overlooked in that book. In a nutshell, I don't like the book much. So, what according to you guys is the ultimate toughest physics problem book and an equally great physics text with terrific explanation of concepts. I maybe asking a bit much, but I hope you can help me. I hope you guys can understand my level of knowledge in physics. I am 18 yrs old. Thanks.