Problems to Enjoy presents an enormous selection of mathematics problems for middle and high school students. Teachers will find it especially useful; divided into four categories and three grade levels, the problems are easily searchable. Eventually, the site's creators hope to "build up a comprehensive library of problems in a format that is simple to access, download and customize." The collection is already quite substantial. Number problems, algebra, geometry, and statistics are the main topics, and each has a long list of fun, educational exercises. An easy-to-use Web form allows users to submit original problems for inclusion on the site.