The level of a song in O2Jam is a rating of its complexity, in contrast to the real meaning of level in computer and video games, but relates to missions in O2Jam.

In O2JamEdit

In O2Jam, levels are assigned to each notechart (i.e., with different difficulties) in a song. The levels are computed from 1 and above, via analysis of the notechart. For reference, Lonely Song EX (an easy song) is level 1 while End of Fight HX (a hard song) is level 38.

In O2Jam X2Edit

In O2Jam X2, levels can only possibly take values from 1 to 100. Since EoF HX is currently the highest-leveled song, it takes the level 100.