When the game starts off, you will be a purple snow plow. Use the two arrows next to the purple snow plow to select your character. You can thenpress the button with the i to get to the instructions again if you need it. Then, there's the play button. Once you press that, you will start a new game. Your Christmas tree is your cursor. Your character will follow your cursor if you put your mouse/finger down depending on if you're using mobile or computer. You can build up snowballs as you're moving. Once you let go, the snowball will roll, and if it hits and ai, then you win.
