MindCipher for some new-to-you riddles and brain teasers. Mind Cipher is a collection of brain teasers, logic puzzles, and riddles submitted by members of the MindCipher community. All submissions placed into one of ten categories. The categories include mathematics, logic, lateral thinking, and physics. All submissions are ranked one a difficulty scale of 1-10.
Applications for Education
MindCipher could be a great resource to consult during those times when you have a few minutes of "down-time" with your students. Bring up one of the Mind Cipher puzzles to keep them engaged in thinking even if they're not thinking specifically about your content area.