Press the up key to control the mammoth. If you touch the tree, minus 1 is deducted. And, if you do not touch the tree, 1 is added to the score which tells you how many times you did not touch the tree. If, when touching the tree, score is increasing, click the green flag to avoid that bug. You may have to click on it many times. Last of all, but not the least, when you reach 20, you win !!!
