In Wario Blast there is a secret password (5656 or 6565) which enables "The Battle" mode. In this mode the player should kill as many enemies as possible during an unlimited time. I kill a grand total of 0 enemies and I get to the results screen as soon as possible.
Category: uses a password, pacifist (no enemies are killed).
I include an encode in GIF format: http://img441.imageshack.us/img441/7380/74253584.gif
Nach: While an entertaining battle mode run may be acceptable, this sadly is not. Special modes which don't offer anything are not acceptable for the vault, rejecting.