We can give an approximate definition of power leveling that reward a player based on their actual contribution to the completion of the task. The purpose of it is to gain experience points as quickly as possible and strong your characters to your desired levels. There are three ways of power leveling. The first one is when you are in a single-player games, you can gain experience points by finding opponents that give a lot of experience points for very little challenge or by going to an area with very powerful monsters and making great use of the game's healing system. The second way is when you are in multi-player games, if your power is too low to defeat enemies you can ask for help from a player with much greater power than the opponents. Defeating high level challenges rewards the lower level player with experience points more rapidly than normal. The last but not the least way is that may gain levels is "grinding" or constantly staying in one area of the game and killing monsters over and over. Recently, some online companies set up offering power-leveling services. The customer provides the company with the username and password for their account, and the company assigns an employee to play the character for the customer until a desired level is reached. This is also what our company should do.