Power-leveling is most frequently employed in multi-player games, where it usually refers to a player that is of much greater power assisting a player of much lower power in defeating enemies that are far too powerful for the low-level player, but are easily and quickly killed by the more powerful player. This practice is also referred to as "tanking", where a high level character or "tank" will act similarly to the real world counterpart by acting as a shield for the low level character, thus allowing him to defeat the high level challenge without fear of penalties associated with such challenges. Defeating high level challenges rewards the lower level player with experience points more rapidly than normal. In general this is considered a form of cheating, or manipulation of the game system for unintended results. However, some view it as a strategic means of gaining levels, especially on single-player RPGs and among friends on MMORPGs.
