Instructions
Select "Custom Duel" from the main menu and select it by pressing the "X" button to begin creating your own duel with your own options.
Insert memory cards into the hard drive depending on the number of players playing. For instance, push in your memory card and a friend's to play against your friend. Plug in only yours to play against yourself. Plug in your card and a blank card to play against the computer.
Scroll through the options to change different things about the duel, such as the beginning life points, the recharge of your magic and to save or edit the deck. Take note of two options: "Select Deck" and "Build Deck."
Choose "Select Deck" to find a pre-built "Deck Master." Scroll through the list until you find a deck you want to use and press "X" to use it in the custom duel.
Select "Build Deck" to build your own deck. Pick the card limit for your deck and scroll through the cards. Press "X" to choose cards until you have created your own Deck Master.