In many video games, the goal is to defeat all the enemies and complete the level. However, sometimes there are optional objectives that can be completed for extra rewards. These could include rescuing hostages, finding secret areas, or destroying certain targets. Sometimes these objectives are required in order to progress to the next level or stage of the game. Other times, they are simply bonus goals that provide an additional challenge. In any case, it is important to know what the objectives are in order to complete them and earn any associated rewards.