These cards are laid down on the field from your hand to activate them. The only time you can deplete the opponent’s life points is when there are no monsters defending the opponents side of the field and your monster attacks, if your monster attacks another monster with lower attack points or if the effect of a trap or spell card says so. The general idea of the game is to use monster cards with the support of trap cards, and spell cards to attack and deplete the opponent’s life points. The game starts out with a deck or cards in which you draw out five cards. The winner of the game is not determined by the duelist with the strongest monsters anymore, but it is determined by the duelist with high-level prediction and intuition skills to formulate strategies. As the popularity of the game grew with the release of new cards every day, the game has taken a new level in the competitive world. Today, people can duel each other virtually from all over the world. Eventually, the game grew more in popularity as internet became more accessible to people. The game started from collectors buying the physical cards and challenging each other to duels. The game was based off of a fictional game from a popular manga and anime franchise that manga artist Kazuki Takahashi had created. The Yu-Gi-Oh Trading Card Game is a collectible card game originated from Japan and was published by Konami. Game Theory in Yu-Gi-Oh Trading Card Game