Double click the flag. Use the arrow keys to move from left to right and jump. Avoid the red. reach the right side of the screen to get to the next level. Press M to mute the music, and N to turn it back on. There's 42 levels. If you get stuck in a wall, press down to slide off faster. If you can't get to the second level by hitting the right side of the screen(I mean with the circle, don't actually hit your screen), press the green flag again. Have fun!
Made with the help of this video: https://www.youtube.com/watch?v=ytBv2-FJ6xc by @PullJosh.
