The rules are simple, you know them. Press the 3 lines or 'm' to return to Main Menu. The gear or 'i' to access Setttings where you can change speed, colour, size, and volume. The parallel lines or 'p'/space will pause the game, and the reload symbol or 'r' will restart your game. But there's a twist! See the green Energy Bar on the right, that will go down each square you move, and will go up with each apple. After enough apples are eaten it will upgrade and go down slower.