Darwin's Game (ダーウインズ ゲーム, Daawinzu Gemmu), often abbreviated as "D-game", is a killing game in which players must fight other players for "points", which can then be exchanged for money or various supplies meant to aid them in the game. It is mandated by a mobile app that goes by the same name, which makes it very important for players to have their phones with them at all times.
The premise of Darwin's game is that players must kill one another for gain. In a battle between two players, only one will win, usually by killing the other player. The winner will then receive the loser's "points," which are used to obtain various goods or services.
Most of the players who have participated or are participating in Darwin's Game joined the game without fully realizing that joining would both mean that they cannot leave, they cannot fully avoid encountering Battles, and they must kill other players to gain points.
Upon creating an account in the game, the image of a snake biting the player's neck flashes into their mind, and from then on cannot delete their account or leave the game; the only way to "leave" the game would be to win.
It also appears that as a result being bitten by the snake, not only will the player be permanently joining the game, a bar code and symbol appear on their neck where the snake had bitten them.
There are two main ways that a battle can be initiated in the game. The first way is by challenging another player through the app. After the battle is initiated, one of the two players is teleported to the location of the other player.
The battle then lasts for a duration of one hour, during which both players must attempt to kill each other. If neither one dies by the end of the hour, the one with the most points wins, and the other dies. Points are rewarded for three aspects of the battle: "Damage", "Technical", and "Artistic".