Glyphs Apprentice is one of those puzzle games that fits perfectly in a school setting. It's complex and safe enough to meet the requirements of school while teaching/challenging kids how to use tools and problem solve. Teachers looking to incorporate something into the class may find a game like this, a rewarding skill builder.
This game is available on Steam, but I could personally see it making the biggest splash in schools.
Glyphs Apprentice challenges you with with brain teasing puzzles as you take on the role of an apprentice mage trying to learn more about magic and creating your own spells. Your goal is to become a Mystic in the Circle of Mages. So while I recommend this to teachers for their students, if its something that peaks your interest grab it on Steam.