Here are the rules of Yu-Gi-Oh when Bandai owned the rights to the card game in 1998 before they sold out to Konami
Rules
There are only 13 official rules in this game:
~Rule ➀~
Both players must use the same number of cards as their Decks.
~Rule ➁~
Draw 5 cards from your Deck to form your hand.
~Rule ➂~
Select 1 Monster Card from your hand and play it to start a Battle.
~Rule ➃~
To determine the result of the battle, compare the ATK of your attacking monster with the DEF of the attacked monster.
~Rule ➄~
If your monster’s ATK is higher, your opponent’s monster is destroyed.
~Rule ➅~
Even if you destroy the opponent’s monster, if the DEF of your monster is lower than the ATK of your opponent’s monster, your monster is also destroyed.
~Rule ➆~
When the battle ends, draw 1 card from your Deck and you can end your turn.
~Rule ➇~
Each turn will continue like this, until both players’ Decks are empty.
~Rule ➈~
Each player counts the total Level Stars of all monsters that they destroyed. The player with the highest amount is declared the winner.
~Rule ➉~
If you have Spell, Trap or Equip Cards in your hand, you can put them in play face-down.
~Rule ⑪~
You can activate your face-down Spell, Trap or Equip Cards at any time during a battle.
~Rule ⑫~
When the effect of a Spell, Trap or Equip Card is used, it is discarded.
~Rule ⑬~
When a player’s Deck is empty, the Duel will continue until the other player’s Deck is empty as well