Hey guys, I'm looking for a site like brilliant.org or better yet, projecteuler.net. This last one is directed to solving problems by using a computer. I'm looking for a site like projecteuler, with problems answerable by hand/pencil. Does anyone know of a site like that? It could also be a book, if there isn't any good site. EDIT: This is not supposed to be on academic guidance. I already reported this thread, to be moved to the right forum.