Hopsa
Building a dam is hands-on physics: where water flows, how it pushes and why some walls leak. It's also a perfect team project, because one person can't carry enough stones alone.
The steps are in the app
Step-by-step instructions, tips and an easier and a harder version are waiting in the Hopsa app – along with 300 more ideas matched to your kids’ ages.
Coming soon to the App Store and Google Play
