To start playing snake, open the website snakefun.org and click the "Play" button. You will see a board with a snake inside, press any arrow key or tap on the screen to make the snake start moving.

Use the arrow keys on your keyboard to control the direction of the snake. The goal is to eat the apple-shaped food that randomly appears on the playground. Each piece of food the snake eats makes it longer.

As the game progresses and your snake grows longer, you need to avoid crashing into the walls of the playing area or into the snake's own body. The game ends if the snake hits a wall or itself. The challenge is to keep the snake moving and eating food without colliding with any obstacles, aiming to achieve the highest score possible by making the snake as long as you can without ending the game.