You, as the player, will be travelling from planet to planet, fighting enemies and achieving the objectives set out for you. The majority of these objectives are mandatory, but a few of them will be optional. While some objectives will usually lead to dead ends, sometimes you will receive information from someone or an Infobot that will open up another planet for you to explore. There’s a few instances in the game where a way will be locked until you go and retrieve a gadget of some kind on another planet.