There are two types of missions in the game, Exclusive and Alliance/Event missions. Exclusive missions are more valuable and give 120% to 200% more bonus points than Alliance/Event missions. You can refresh Exclusive missions, and the refresh time increases every time you clear one, but it resets daily.
Alliance/Event missions can be accepted by any member of the alliance, and R4/R5 members can refresh them every 30 minutes. There are three different colors for each mission, blue, purple, and orange. Blue missions give the least points, purple missions give medium points, and orange missions give the most points.
There are five tiers in the game: Rookie, Junior, Senior, Elite, and Legendary. If you rank in the top three positions, your tier will increase, and if you reach Legendary, which is the maximum tier, you will remain there.
However, if you rank in the bottom three, your tier will be demoted, and if you consistently rank poorly, you will stay in the lower tier. Each tier offers different rewards for personal ranking, alliance ranking, and alliance monuments.