YOU CANT

I think ther is some kind of ar code or sumin coz i jus dueled this girl tht only had 5
cards in her main deck and 30 in the fusion! ther is no way 2 beat her coz the 5 cards in
her deck r all da pieces of exodia! OoO!

you have to have a action replay to do that. i dont know the code though

well as my theory that the fusion deck are also the prt of the main deck too! well..... it
maybe can be only use by cheats or something. remember this! mark my words: you should
better not to always use cheat or action replay codes cause it may make an error and it
will be kind a boring if you dont play fair!

how u play 5 card deck

duh action replay

type in deck is always read as 40 cards it worked for me

use a flash card and then select cheats then search for a cheat called:amount of cards in
deck always 40.or something like that.

yea its only action replay code... if you dont have it then you must create a deck 40-80
cards, 15 side cards(optional), and 30 fusion cards (optional)