What are some strategies for adjusting my pacing when students need more time to grasp key concepts?

What are your favorite play based learning activities you have used with your students?

Our state had Dreambox for many years as a way to reach tier 2 and 3 intervention students. The state didn't fund Dreambox this year, but did replace it with Zearn. I've heard great things about Zearn, but I haven't had the opportunity to ever use it. If you have experience with it, will you give me your thoughts, any tips/tricks, and/or ideas on how best to share with teachers all the features? Thanks so much!