In Sum Tracks 2 some basic Math knowledge is necessary to add up or lower down any number to zero. Use strategy and logic in this game. All the main circles, which can be moved with Mouse click and dragging, should reach the amount of zero, necessarily. At first the tracks will be obvious, to learn the basics. Once the challenge really begins, it's important to plan the next sum to make sure all the main circles will be reset. Drag them in a track that should work, restarting the level in case there is no clue on where the mistake was done.