Autumn Hashtag Block Puzzles — Fall STEM for Elementary Autumn Hashtag Block Puzzles are printable fall STEM activities for elementary students that build spatial reasoning, counting, and problem-solving with Hashtag Blocks. These NGSS-aligned fall STEM centers include ready-to-use puzzle mats featuring classic autumn images—pumpkins, apples, leaves, sunflowers, acorns, and more. Perfect for small group learning, centers, fast-finisher bins, or makerspace tubs, each challenge gets students mode