Levels require a certain amount of Exp, once you have that amount, you automatically level up.
Lvl - Exp Requirement
001 - 100
002 - 200
003 - 400
004 - 800
005 - 1,600
006 - 3,200
007 - 6,400
008 - 12,800
009 - 25,600
010 - 51,200
011 - 102,400
012 - 204,800
013 - 409,600
014 - 819,200
015 - 1,638,400
016 - 3,276,800
017 - 6,553,600
018 - 13,107,200
019 - 26,214,400
020 - 52,428,800
