Hippo - Learn To Count and Add!Learn To Count and Add with Hippo! Create the swimming pool and share the lifebuoys between the players. Your goal? Be the first one to throw all your lifebuoys in the water. Two options: give them to the cute hippo or throw them in the pool! Be careful when you choose where to throw them, as they can jump back out of the water right into your arms! Hippo develops the ability to calculate, to anticipate, and to think strategically. You can find a lot