Sum

Hey guys, First, I'm too excited to have Sum on Product Hunt. It's a really, really big deal for me. I hope you people like what I made. About Sum: Everyone knows how to add. We do it every day. But it's not as easy as we think it is. I like playing such games that are simple in concept but actually tease your mind, and hence - Sum. I wanted to not only create something fun but also make the experience wonderful with a nice design and overall good UX. How fast can you add two numbers?