The present book is based on the view that cognitive skills are best acquired by solving challenging, non-standard probability problems. Many puzzles and problems presented here are either new within a problem solving context (although as topics in fundamental research they are of course long known) or are variations of classical problems which follow directly from elementary concepts. A small number of particularly instructive problems is taken from previous sources which in this case are generally given. This book contains far more problems of a statistical nature than the competition. It will become a handy resource for professors looking for problems to assign for a course, and will be of interest to undergraduate math students, as well as a more general audience of amateur scientists.