Yu-Gi-Oh! Duel Monsters/Gameplay

Control

 * : Move the cursor
 * : Confirm
 * : Cancel/Go back

Menu
At the title screen, you'll see the 4 options available:
 * Campaign (キャンペーン Kyanpēn): The main game mode, where player duel against AI player.
 * Versus (たいせん Taisen): Duel with other player, required the Game Link Cable.
 * Trade (トレード Torēdo): Trade cards with other player via the Game Link Cable.
 * Records (せいせき Seiseki): View a statistics and other information about the player.

Deck Construction

 * Your Deck must contain exactly 40 cards (*This is hard cap: so if you want to change a cards in your Deck, you must first move some cards from your Deck to your trunk).
 * There is no limit of how many copies of the same card can be in one Deck.

Duels

 * Both player's start with 8000 Lifepoints and 5 cards in their hand.
 * In campaign mode, the human player always goes first.
 * At the beginning of player turn, he/she draw 1 card from their Deck (except during their very first turn).
 * A player can only play 1 card per turn (either Summon a monster into one of five available zones, or activate a Magic Card).
 * If a player play a Monster Card, they can choose to declare an attack with that monster, or put them into Defense Position (player cannot declare an attack during first turn).
 * Monster Card always placed face-up onto the field.
 * When a monster declared an attack, one of these situation is applied:
 * 1) Attack Position vs. Attack Position: The monster with lower ATK will be destroyed, and the controller of that monster take damage equal to the ATK difference of both monsters. If both monsters have the same ATK, they are both destroyed.
 * 2) Attack Position vs. Defense Position: If the attacking monster have higher ATK than the defending monster's DEF, that Defense Position monster is destroyed. If the attacking monster have lower ATK than the defending monster's DEF, the controller of the attacking monster take damage equal to the difference of their ATK and their opponent's DEF, and neither monsters is destroyed.
 * 3) When there no monster on their opponent's side of the field, player can direct attack their opponent's, the monster's ATK is deducted from the attacked player.
 * The turn end when the player has chosen an action for all of their monsters, or they activate 1 Magic Card.
 * There is no Effect Monsters (aside from Exodia the Forbidden One, Petit Moth, Larvae Moth, Cocoon of Evolution, and Great Moth).

Modified ATK/DEF
NOTE: If the monster have a Level -1 (due to Spellbinding Circle), that monster original ATK/DEF will be decreased by 60%
 * Equip Magic Cards will increased that equipped monster Level by 1 (Max. 2), Each boosted Levels increased that monster ATK/DEF by 60%
 * Field Magic Cards will either increased or decreased the monsters ATK/DEF by 30%, or didn't change at all.

Victory Conditions

 * 1) The player's who make their opponent's LP 0 is the winner.
 * 2) If either player's hand is empty, the player's with the most LP is the winner.
 * 3) If a player has "'Exodia the Forbidden One'", '"Left Leg of the Forbidden One'", "'Left Arm of the Forbidden One''', "'Right Leg of the Forbidden One'", and "'Right Arm of the Forbidden One"' in their hand, he/she automatically win the Duel.