Note: This trick requires two PSPs with the game. You also need one character that is over level 40. Have the person with the higher level character invite a lower level character into his game for multi-player mode. The lower level character should be below level 30. Then, have the lower level character stand back and hit them with arrows (if possible). The lower level character should get experience points, even though he is not fighting. The lower the level, the better this will work.