Your mission is very simple - direct reptile to food so it will grow longer. Avoid, hitting obstacles and your own tail. Try to collect as many points as you can. When you complete one level you will be prompted to proceed to next level, you may proceed or stay at current level. Your completed level will appear in Options/Labyrinth menu, so you will be able to select this level in the future. Levels of complexity are Easy, Medium, Hard, Nightmare; highscores are different for each complexity level.