Prototec Challenge

 prototec:

prototec is and free app that helps you with math like subtraction 

prototec has different stages to help you with your learning 

stages: 2-3 4,5,6,7,8

I have leveled up to stage 4 

you don't have to level up because all of the levels are unlocked 

here is a photo of my Certificat of my level up