Your objective is to survive long enough to lay eggs and raise your young. In order to survive you will have to avoid or devour the hostile red serpents.
Big serpents swallow little serpents, so you must attack the red serpents from the rear until they become shorter than you. When this happens, they turn green and can be attacked from the front.
All serpents lay eggs. Eggs eventually hatch unless they are eaten first. They are very nutritious— frogs look for them and eat them, as do enemy snakes. Serpents lose one segment when they lay an egg. If your serpent tries to lay an egg when he is only two segments long, he will die.