back to school Holiday- Challenging hard Riddle & Scavenger Hunt Clue Card activities | treasure hunt clue cards Indoor outdoor Fun poster Activity, Brain break stations, brainstorms game, Homeschool enrichment, Critical thinking riddles, Holiday brain teaser, Gifted Enrichment, Designed for students in 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th, and 12th grades, upper elementary, middle school, or high school, early finishers, middle schoolers, high schoolers, Gate, gifted and talented, secondar