Crystals are the game's premium currency. They are used to purchase high end items. They can be obtained through several methods. Each stage has three objectives that can be completed. A Crystal will be awarded when all three of them are done. Additionally, because the objectives vary based on difficulty setting you can earn a total of three Crystals per level by completing the objectives under the easy, hard, and elite difficulty settings. The daily bonus for logging in will occasionally reward you with Crystals. The more consecutive days you log in, the better your rewards will be. The Infinite Dungeon is an endless monster challenge. You can try it as often as possible, however you will need to wait after five attempts. The longer you survive, the better your score. A leaderboard keeps track of every player's score, and a Crystal award is given weekly to the top players. Special events are held from time to time that may include Crystals as a reward. Play and complete the Continuation quests to earn Crystals.