Identify the derivative - game

This interactive figure is a bit of a game. Two or more functions will be drawn. One of them is the graph of a function , and one of them is the graph of its derivative, . Identify which is which! Challenge yourself to get to a point where you feel comfortable identifying and . See if you can get to a score of at least 30. Be careful, though: if you guess wrong you'll lose all your points. Good luck!