Crabtree Plus is a new web-based resource that combines the high-quality of Crabtree Publishing’s educational book series with open access dynamic digital content. Intended to add to students’ understanding in an entertaining way, Crabtree Plus includes engaging simulations and interactive activities that reinforce and extend core series concepts. Supporting the best practices for digital education resources animated characters provide narrated support and guide learners through scaffolded challenges. The intuitive design and embedded feedback encourage independent learning.