EXP Zero (EXPゼロ, EXP Zero?), also known as "Zero EXP" and "No Experience," is an ability introduced in Kingdom Hearts II Final Mix. It prevents the player from gaining EXP for as long as it is equipped.
This ability allows the player to complete the game without gaining EXP, and therefore staying at level 1, resulting in a more challenging play-through.
In Kingdom Hearts II Final Mix, No Experience is a support ability that costs 1 AP to equip. It negates normal EXP, but not the various types of Form EXP.
Learning EXP Zero
Kingdom Hearts Final Mix
Kingdom Hearts II Final Mix
Kingdom Hearts Birth by Sleep
Kingdom Hearts 3D: Dream Drop Distance
Kingdom Hearts III
Kingdom Hearts 0.2 Birth by Sleep -A fragmentary passage-
Kingdom Hearts 358/2 Days and Kingdom Hearts Re:coded