yes you can
you just cant use them in official duels(such as tournaments)
only in street duels were you wont get kicked out or lose right away because of
a banned card, i dont play in tournaments cuz half my deck is illegal
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there is no such a code... sucks
you have to beat the game you have to beat the game
The rules are here: http://entertainment.upperdeck.com/yugioh/en/gameplay/rulebook/rulebook_v06_EN.pdf
You have to 2 memory cards, which decks already configured, then select 2 player mode, pick your stage or if you have a premade stage you can use that, selet whether or not you want the players cards to be showing and then your good to do
There is no real hard limit - as long as you've got a spell card in hand, and a slot in the S/T zone for it to go, then you can activate it.