Hopsa
Winding the rubber band stores energy, and as it unwinds the paddle pushes water backward – so the water pushes the boat forward. Testing and tweaking until it sails straight trains planning and persistence, and the first time it moves on its own is pure joy.
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
