Duplicate monsters
Select versus mode and load two identical games. Set
the "Prize Monster" to the monster to be duplicated.
Win using either side, then save the game.
Two spells in one turn
Use a spell, then quickly save the game. Press [Select]
to allow your opponent to take a turn. When it is your turn again,
load the saved game. You will be able to use a spell again, but
your magic points will still be deducted.