To be able to defeat everyone in the easier you must have some very good cards of
course but there is a cheat to help. Put out your good card whenever you get the
chance (best if the other player just attacked, so you can see his monster's points)
and attack if you want. After his turn is over send out the weak monster in whatever
mode you want (defense or attack, set or face-up). If your opponent has a trap or
magic card on the field of course you do not want it to be widespead ruins or bear
trap so have the weak monster attack to see what happens. If nothing happens you
attack with your strong monster and now you know what the monster is (if he set it)
and you kill it. You should lose the weak monster so make a monser that you do not
need but not too weak or you will lose a lot of life points. After this attack you
now should set your next monster in defense position so you will not lose life
points again. His monster will be in attack position and will lose life points when
you kill it so besure to have enough attack points that he can not kill you.
Submitted by Master-Merlin 
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This is easy so you probably know it. If you are stuck with one strong guy in play 
and you keep destroying one of their guys, but they just put a new one and you cant 
take away any of his LP this will help.While your guy is in play put in a small guy, 
for example a basic insect, put him in face up and in defence so when they destroy 
it you dont lose any LP.Now when their down there card is in attack.So on your turn 
you attack the card and make the opponent lose LP. 
Submitted by AngelKisses939