Four Seconds alternatives

Hey guys, I am so proud to share Sum with all of you today. Currently with 20,000+ downloads, it's really a simple idea converted to one really addictive & challenging game! How fast can you add two numbers? Really looking forward to all your feedback! :)

A fun, educational, chemistry arcade puzzle game. Tetris meets organic chemistry. At the tip of your fingers is the power to fuse together the elements vital to life. Fight antimatter, battle gravity and shape matter to your will!