Challenges

There are 4 types of Challenges currently ingame.
 * Gold-Challenges where you try to get as fast as possible a specified amount of Gold
 * Endless Mode where you can collect more effectively green Shards
 * Chest-Challenge where you try to destroy a Chest in a limited time
 * Golem-Challenge where you kill Golems to gain XP (and inactive Shards in Boss-Golem-Fights)