Easy Rank Up
Once you beat both sides of the roses, you can go to custom duel and the edit map selection will be available. Suround your enemy in labyrinth but leave him a spot to summon a monster. When you finish the field should look like this.
N N L C L N N
N N L C L N N
N N L L L N N
N N N N N N N
N N N N N N N
N N N N N N N
N N N N N N N
N= Normal
L= Labyrinth
C= Crush
After that summon your five favorite monsters and just run the timer out. Your monsters should automatically level up if they don't have a rank yet. If they are at a high level rank it might a few tries of this but they will level up.
We have more cheats and tips for this game here, Yu-Gi-Oh! Duelists of the Roses cheats
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