Double Dungeons

Level 22 (Start):
Enter 2R3KD4RG0J9D3YT0664LJ as a password.

Level 22 (final Boss):
Enter YNzYSMChriGIgLV-ihOdfCGe as a password.

Alternately, enter cHR0EScxgoAqiky7ihOfeBGe as a password.

Invincible player two:
Enter any valid password for player one, then enter KKKKKKKKKKKKKKKKKKKKKKKK as a password for player two.

Level 45 character:
Start a new game in one or two player mode and select a dungeon. Immediately press Run when game play begins to display the current password. Replace characters 10 through 14 in a one player password with "NNNb". For a two player password, replace characters 34 through 38 with the same sequence. Reset the game and entered the modified password to begin game play.

65535 HP:
Enter Player01 or Player02 as a password, with the remaining password locations filled with + or - characters.

Hint: Pass up enemies:
If you reach an enemy that you can not defeat, turn rapidly back and forth while pressing Attack and holding Forward. If done correctly, you will walk right over the enemy.
Information in this section was contributed by Logan Stromberg.