Fastest EXP Gain (NieR: Automata)

There is a semi-secret sub-boss at the entrance of the Amusement Park who can be defeated for a large sum of EXP, advancing the player several levels upon each activated encounter. There used to be a bug in which the player could use 9S's hacking ability to skip the fight. However, the bug has since been patched and in order to fight the Bunny he must first be provoked through physical attacks.