Hint: Symbols:

Feather: Indicates that it is flying and can only be attacked by other flying monsters. It also can fly over other monsters, but unfortunately, other monsters can move under it. Monsters with this symbol use double the movement cost.

Tunnel: Indicates that it digs underground to move around, so it can move past other monsters.

Arrow: Indicates that this monster can attack a flying monster.

Hint: Effective attacks:

Dragon is good against Spellcaster
Warrior is good against Dragon
Beast is good against Warrior
Spellcaster is good against Zombie
Zombie is good against Beast

Hint: Millennium Shield:

Use Mighty Mage's effect and attack any enemy monster two squares away for one Magic Crest.

Use Orgoth's effect until he has 50 attack power and destroy the shield.

Use The 13th Graves effect to give up two Magic Crests and destroy one heart from any opposing monster and himself. Also the Millennium Shield has some weaknesses. He cannot move and only has one heart life. Only a monster with 50 attack power or more can defeat it.

Use any monster with an equal 40 attack vs. 40 def and have him or her waste all of their Defense Crests until there are no more.

Summon Blue Eyes Ultimate Dragon and destroy it. Note: Create a dungeon path to connect to the opponent and make it vanish into thin air.

Summon Exodia The Forbidden One.

Hint Mystic Horseman:
When you play Mystic Horseman, his effect can only be activated when he looses at least one heart life. The more hearts he loses, the more ATK strength he gains. For example:

-1 Heart: ATK + 10
-2 Hearts: ATK + 20
-3 Hearts: ATK + 30

Hint: Fight Yami Yugi:

1 Kuriboh
1 Strike Ninja
1 Giant Soldier of Stone
1 Mystical Elf
1 Beaver Warrior
1 Mamoth Graveyard
1 Mega Thunderball
1 Knight of Twin Swords
1 Warp Vortex
1 Dark Magician Girl
1 Dark Magician
1 Magician of Black Chaos
1 Black Skull Dragon
1 Black Luster Soldier
1 Summoned Skull
1 Gaia the Dragon Champion
1 Red Eyes Black Dragon

Hint: Protecting heart points:
Buy or win a Great Moth then put it in front of your heart points. Surround it so that the Great Moth is the only way to get to them. For example, put the Great Moth in front of your heart points and put a space between the left and right sides. Only strong flying monsters with an attack of 40 can defeat it.

Hint: Recommended monsters:

Exodia The Forbidden One (automatic victory)
Orgoth The Relentless (raise attack by 10 each turn)
Blue-Eyes Ultimate Dragon (ATK 50)