Experience point

Experience points (often abbreviated as exp or xp) are a representation of a character's advancement and improvement in skills in role-playing games. Experience points are generally awarded for the defeat of opponents, monsters and other obstacles, but may also be awarded for successful role-playing. In games derived from Dungeons & Dragons, an accumulation of experience points increases a character's level (known as leveling or leveling up) which gives the character a predetermined improvement in his or her abilities. In other games, such as GURPS and the World of Darkness games, experience points are spent on specific abilities or attributes. Some systems that use a level-based experience system also incorporate the ability to purchase specific traits with a set amount of experience; for example, Dungeons & Dragons 3rd Edition bases the creation of magical items around a system of experience expenditure (known as burning xp).

In most games, as the difficulty of the challenge increases, the experience rewarded for completing it also increases. As players gain more experience points and/or levels, the amount of experience needed to gain new abilities or levels typically increases. Thus, as the player character strengthens from gaining experience, they are encouraged to accept tasks that are commensurate with their improved abilities in order to advance.

Some RPGs (notably MUDs and MMORPGs) place a limit on how much experience a character can gain from a single encounter or challenge, hoping that it will reduce the effectiveness of powerleveling.

ja:経験値