Besides completing the mission, each stage has four optional objectives that gives bonuses (usually coins) the first time they are completed: * Complete the stage under a certain time * Defeat a certain amount of enemies * Collect a certain amount of coins * Complete with a high amount of life (above 90%) or full life The game also has optional Quests (퀘스트) that rewards players that complete them. After completing the Quest, a new quest related to the previous one (mainly the double of the requirement from the previous one) becomes available.