2. Copy of the game: After the player's combat power level reaches a certain requirement, the player can start to challenge a copy of the game. Different copies of the game will give players different amounts of gold coins. The more difficult the copy is, the higher the number of gold coins players can get.
3. System activities: The game will launch some game activities irregularly. The bigger the activity, the more gold coins are awarded to players, and there are also some rare items.